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joefutrellejoefutrelle
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much hacking
1 parent 25c533e commit 7003e5d

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‎1 lists.ipynb

+259-259
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‎1 performance.ipynb

+152-152
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"input": [
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"from random import random\n",
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"\n",
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"def random2d(n=1000):\n",
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" return [[random() for j in range(n)] for i in range(n)]\n",
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"\n",
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"# now let's do 2d averaging\n",
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"def average2d(a):\n",
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" # there's no way to tell how many elements\n",
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" # there are because each list in the list of lists\n",
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" # could be a different length\n",
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" n, s = 0, 0\n",
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" for row in a:\n",
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" for element in row:\n",
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" s += element\n",
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" n += 1\n",
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" return s / n\n",
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"\n",
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"n = 3000\n",
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"\n",
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"R = random2d(n)\n",
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"average2d(R)"
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],
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"language": "python",
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"outputs": [
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"input": [
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"%%timeit\n",
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"\n",
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"# how fast is this?\n",
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"average2d(R)"
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],
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"language": "python",
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"metadata": {},
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"outputs": [
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{
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"1 loops, best of 3: 604 ms per loop\n"
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"prompt_number": 3
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},
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{
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"cell_type": "code",
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"input": [
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"import numpy as np\n",
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"\n",
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"R = np.random.uniform(size=(n,n))\n",
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"R"
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],
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"language": "python",
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"array([[ 0.16442591, 0.06019215, 0.13574315, ..., 0.95115628,\n",
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" 0.32276626, 0.69702153],\n",
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" [ 0.31768723, 0.93409853, 0.34722531, ..., 0.52851659,\n",
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" 0.36773928, 0.9316535 ],\n",
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" [ 0.91488032, 0.88127737, 0.87042717, ..., 0.85553466,\n",
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" 0.30377961, 0.95292511],\n",
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" [ 0.86619297, 0.64068635, 0.0671692 , ..., 0.52829387,\n",
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" 0.52078797, 0.13971299],\n",
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" [ 0.50046661, 0.2426449 , 0.59872748, ..., 0.76729318,\n",
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" 0.5692301 , 0.74018849],\n",
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" 0.27391853, 0.18721739]])"
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"np.mean(R)"
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"outputs": [
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"text": [
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"100 loops, best of 3: 10.4 ms per loop\n"
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"from random import random\n",
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"\n",
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"def random2d(n=1000):\n",
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" return [[random() for j in range(n)] for i in range(n)]\n",
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"\n",
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"# now let's do 2d averaging\n",
21+
"def average2d(a):\n",
22+
" # there's no way to tell how many elements\n",
23+
" # there are because each list in the list of lists\n",
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" # could be a different length\n",
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" n, s = 0, 0\n",
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" for row in a:\n",
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" for element in row:\n",
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" s += element\n",
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" n += 1\n",
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" return s / n\n",
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"\n",
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"n = 3000\n",
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"\n",
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"R = random2d(n)\n",
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"average2d(R)"
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