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railbotan
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Mar 5, 2022
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| { | ||
| "cell_type": "code", | ||
| "source": "first = np.random.randint(-15, 15, 25).reshape(5,5)\nprint(first)\nfirst=np.array([i*i if i<0 else i for i in first.ravel()]).reshape(5,5)\nprint(first)", |
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Лучше использовать flatten вместо ravel, так как ravel сохраняет ссылки на оригинальный массив. Также лучше использовать np.where или булевую индексацию
railbotan
reviewed
Mar 5, 2022
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "source": "r, c = random.randint(3,7),random.randint(2,12)\na = np.random.randint(-15, 15, r*c).reshape(r,c)\nprint(a)\nN = r*c//2\nprint(N)\ns=set()\ncount=0\nsample=[]\nwhile True:\n i, j = random.randint(0,r-1),random.randint(0,c-1)\n if (i, j) not in s:\n s.add((i, j))\n count+=1\n sample.append(a[i][j])\n if N == count:\n break\nprint(sample)", |
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Лучше использовать np.random.choice
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