463 lines
8 KiB
Plaintext
463 lines
8 KiB
Plaintext
{
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"cells": [
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{
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"cell_type": "code",
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"execution_count": 107,
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"id": "4ccf18f3",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[[ 0 1 2 3]\n",
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" [ 4 5 6 7]\n",
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" [ 8 9 10 11]]\n",
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"\n",
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"Is it a view? False\n",
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"\n",
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"dtype\tint64\n",
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"ndim\t2\n",
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"shape\t(3, 4)\n",
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"strides\t(32, 8)\n",
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" \n"
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]
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}
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],
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"source": [
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"import numpy as np\n",
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"\n",
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"\n",
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"def is_view(a):\n",
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" return a.base is not None\n",
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"\n",
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"\n",
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"def print_info(a):\n",
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" txt = f\"\"\"\n",
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"Is it a view? {is_view(a)}\n",
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"\n",
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"dtype\\t{a.dtype}\n",
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"ndim\\t{a.ndim}\n",
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"shape\\t{a.shape}\n",
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"strides\\t{a.strides}\n",
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" \"\"\"\n",
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" print(a)\n",
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" print(txt)\n",
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"\n",
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"\n",
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"x = np.arange(12).reshape(3, 4).copy()\n",
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"print_info(x)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 108,
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"id": "b68308e8",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[[ 0 1 2 3]\n",
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" [ 8 9 10 11]]\n",
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"\n",
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"Is it a view? True\n",
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"\n",
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"dtype\tint64\n",
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"ndim\t2\n",
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"shape\t(2, 4)\n",
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"strides\t(64, 8)\n",
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" \n"
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]
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}
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],
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"source": [
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"y = x[::2, :]\n",
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"print_info(y)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 109,
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"id": "85feedb0",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[4 5 6 7]\n",
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"\n",
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"Is it a view? True\n",
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"\n",
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"dtype\tint64\n",
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"ndim\t1\n",
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"shape\t(4,)\n",
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"strides\t(8,)\n",
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" \n"
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]
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}
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],
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"source": [
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"y = x[1, :]\n",
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"print_info(y)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 110,
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"id": "dbbb9a7f",
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"metadata": {
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"scrolled": true
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[4 5 6 7]\n",
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"\n",
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"Is it a view? True\n",
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"\n",
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"dtype\tint64\n",
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"ndim\t1\n",
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"shape\t(4,)\n",
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"strides\t(8,)\n",
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" \n"
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]
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}
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],
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"source": [
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"y = x[1]\n",
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"print_info(y)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 111,
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"id": "fc63ad8c",
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"metadata": {
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"scrolled": true
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[ 4 11]\n",
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"\n",
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"Is it a view? False\n",
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"\n",
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"dtype\tint64\n",
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"ndim\t1\n",
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"shape\t(2,)\n",
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"strides\t(8,)\n",
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" \n"
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]
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}
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],
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"source": [
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"y = x[[1, 2], [0, 3]]\n",
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"print_info(y)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 112,
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"id": "aa8effeb",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[[ 0 1 2 3]\n",
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" [ 8 9 10 11]]\n",
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"\n",
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"Is it a view? False\n",
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"\n",
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"dtype\tint64\n",
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"ndim\t2\n",
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"shape\t(2, 4)\n",
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"strides\t(32, 8)\n",
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" \n"
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]
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}
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],
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"source": [
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"# Get the first and third row\n",
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"y = x[[0, 2], :]\n",
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"print_info(y)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 113,
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"id": "4474f8cf",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[[ 2 3 4 5]\n",
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" [ 6 7 8 9]\n",
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" [10 11 12 13]]\n",
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"\n",
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"Is it a view? False\n",
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"\n",
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"dtype\tint64\n",
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"ndim\t2\n",
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"shape\t(3, 4)\n",
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"strides\t(32, 8)\n",
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" \n"
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]
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}
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],
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"source": [
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"y = x + 2\n",
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"print_info(y)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 114,
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"id": "4957469c",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[5 9 2]\n",
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"\n",
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"Is it a view? False\n",
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"\n",
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"dtype\tint64\n",
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"ndim\t1\n",
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"shape\t(3,)\n",
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"strides\t(8,)\n",
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" \n"
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]
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}
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],
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"source": [
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"y = x[[1, 2, 0], [1, 1, 2]]\n",
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"print_info(y)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 115,
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"id": "d1649515",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[[ 0 1]\n",
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" [ 2 3]\n",
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" [ 4 5]\n",
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" [ 6 7]\n",
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" [ 8 9]\n",
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" [10 11]]\n",
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"\n",
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"Is it a view? True\n",
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"\n",
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"dtype\tint64\n",
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"ndim\t2\n",
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"shape\t(6, 2)\n",
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"strides\t(16, 8)\n",
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" \n"
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]
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}
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],
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"source": [
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"y = x.reshape((6, 2))\n",
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"print_info(y)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 116,
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"id": "c5caeb74",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[[ 0 4]\n",
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" [ 8 1]\n",
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" [ 5 9]\n",
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" [ 2 6]\n",
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" [10 3]\n",
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" [ 7 11]]\n",
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"\n",
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"Is it a view? True\n",
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"\n",
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"dtype\tint64\n",
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"ndim\t2\n",
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"shape\t(6, 2)\n",
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"strides\t(16, 8)\n",
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" \n"
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]
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}
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],
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"source": [
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"y = x.T.reshape((6, 2))\n",
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"print_info(y)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 117,
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"id": "15b0d7ad",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[ 0 1 2 3 4 5 6 7 8 9 10 11]\n",
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"\n",
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"Is it a view? True\n",
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"\n",
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"dtype\tint64\n",
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"ndim\t1\n",
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"shape\t(12,)\n",
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"strides\t(8,)\n",
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" \n"
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]
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}
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],
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"source": [
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"y = x.ravel()\n",
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"print_info(y)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 118,
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"id": "38cc1ef3",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[ 0 4 8 1 5 9 2 6 10 3 7 11]\n",
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"\n",
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"Is it a view? False\n",
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"\n",
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"dtype\tint64\n",
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"ndim\t1\n",
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"shape\t(12,)\n",
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"strides\t(8,)\n",
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" \n"
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]
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}
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],
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"source": [
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"y = x.T.ravel()\n",
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"print_info(y)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 119,
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"id": "b7d0cc63",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[ 0 2 4 6 8 10]\n",
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"\n",
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"Is it a view? False\n",
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"\n",
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"dtype\tint64\n",
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"ndim\t1\n",
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"shape\t(6,)\n",
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"strides\t(8,)\n",
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" \n"
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]
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}
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],
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"source": [
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"y = x[(x % 2) == 0]\n",
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"print_info(y)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 120,
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"id": "866e842a",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[[ 0 1 2 3]\n",
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" [ 4 5 6 7]\n",
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" [ 8 9 10 11]]\n",
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"\n",
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"Is it a view? False\n",
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"\n",
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"dtype\tint64\n",
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"ndim\t2\n",
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"shape\t(3, 4)\n",
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"strides\t(32, 8)\n",
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" \n"
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]
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}
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],
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"source": [
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"y = np.sort(x, axis=1)\n",
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"print_info(y)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "a074c89b",
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"metadata": {},
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"outputs": [],
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"source": []
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "320cfb50",
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"metadata": {},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3 (ipykernel)",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.11.3"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 5
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}
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