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Added numpy snippets for reshaping and in-place editing.

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Donne Martin 2015-04-09 13:28:09 -04:00
parent 1f260e392d
commit 475e930f8e
1 changed files with 120 additions and 0 deletions
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numpy/numpy.ipynb
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@ -322,6 +322,126 @@
}
],
"prompt_number": 14
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Reshaping and In-Place Updating"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"e = np.arange(12)\n",
"print(e)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"[ 0 1 2 3 4 5 6 7 8 9 10 11]\n"
]
}
],
"prompt_number": 15
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# f is a view of contents of e\n",
"f = e.reshape(3, 4)\n",
"print(f)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"[[ 0 1 2 3]\n",
" [ 4 5 6 7]\n",
" [ 8 9 10 11]]\n"
]
}
],
"prompt_number": 16
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Set last five values of e to zero\n",
"e[5:] = 0\n",
"print(e)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"[0 1 2 3 4 0 0 0 0 0 0 0]\n"
]
}
],
"prompt_number": 17
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# f is also updated\n",
"f"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 18,
"text": [
"array([[0, 1, 2, 3],\n",
" [4, 0, 0, 0],\n",
" [0, 0, 0, 0]])"
]
}
],
"prompt_number": 18
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# OWNDATA shows f does not own its data\n",
"f.flags"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 19,
"text": [
" C_CONTIGUOUS : True\n",
" F_CONTIGUOUS : False\n",
" OWNDATA : False\n",
" WRITEABLE : True\n",
" ALIGNED : True\n",
" UPDATEIFCOPY : False"
]
}
],
"prompt_number": 19
}
],
"metadata": {}