{"id":52762,"date":"2025-08-11T18:54:17","date_gmt":"2025-08-11T10:54:17","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/52762.html"},"modified":"2025-08-11T18:54:17","modified_gmt":"2025-08-11T10:54:17","slug":"%e5%b0%8f%e6%9d%b0python%e9%ab%98%e7%ba%a7%ef%bc%88three-day%ef%bc%89-numpy%e5%ba%93","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/52762.html","title":{"rendered":"\u5c0f\u6770python\u9ad8\u7ea7\uff08three day\uff09\u2014\u2014numpy\u5e93"},"content":{"rendered":"

1.numpy\u6570\u7ec4\u7684\u64cd\u4f5c<\/h2>\n<\/p>\n

（1）\u6570\u7ec4\u7684\u8fde\u63a5<\/h3>\n<\/p>\n

stack<\/span><\/h5>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u8be5\u51fd\u6570\u53ef\u4ee5\u5b9e\u73b0\u591a\u4e2a\u6570\u7ec4\u7684\u5806\u53e0(\u8fde\u63a5)，\u4f1a\u521b\u5efa\u65b0\u7684\u8f74，\u7528\u4e8e\u6cbf\u7740\u65b0\u7684\u8f74\u8fde\u63a5\u4e00\u7cfb\u5217\u6570\u7ec4，<\/span>\u6240\u6709\u6570\u7ec4\u5fc5\u987b\u5177\u6709\u76f8\u540c\u7684\u5f62\u72b6<\/span>\u3002<\/span><\/p>\n

numpy.stack<\/span>(<\/span>arrays<\/span>,<\/span> axis<\/span>=<\/span>0<\/span>,<\/span> out<\/span>=<\/span>None<\/span>)<\/span><\/p>\n

\u53c2\u6570：arrays：\u6570\u7ec4\u5143\u7d20\u6216\u5217\u8868<\/span><\/p>\n<\/p>\n

（2）\u6570\u7ec4\u7684\u5206\u5272<\/h3>\n<\/p>\n

split<\/span><\/h5>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u8be5\u51fd\u6570\u7528\u4e8e\u6cbf\u7740\u6307\u5b9a\u7684\u8f74\u5c06\u6570\u7ec4\u5206\u5272\u6210\u591a\u4e2a\u5b50\u6570\u7ec4，\u53ef\u4ee5\u6307\u5b9a\u8981\u5206\u5272\u7684\u6570\u7ec4\u3001\u5206\u5272\u7684\u4f4d\u7f6e\u6216\u5b50\u6570\u7ec4\u7684\u6570\u91cf\u3002<\/span><\/p>\n

numpy.split(ary, indices_or_sections, axis=0)<\/span><\/p>\n

\u53c2\u6570：ary：\u6570\u7ec4<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0indices_or_sections：\u53ef\u4ee5\u662f\u4e00\u4e2a\u6574\u6570，\u8868\u793a\u8981\u5c06\u6570\u7ec4\u5e73\u5747\u5206\u5272\u6210\u591a\u5c11\u4e2a\u5b50\u6570\u7ec4；\u4e5f\u53ef\u4ee5\u662f\u4e00\u4e2a\u6574\u6570\u5217\u8868，\u8868\u793a\u5206\u5272\u7684\u4f4d\u7f6e\u3002<\/span><\/p>\n

import numpy as np<\/p>\n

# a = np.array([1,2,3,4,5])
\n# b = np.array([6,7,8,9,0])
\n# # \u5c06\u591a\u4e2a\u6570\u7ec4\u8fdb\u884c\u5806\u53e0，\u7ef4\u5ea6\u4f1a\u53d1\u751f\u53d8\u5316
\n# c = np.stack([a, b], axis=1)
\n# print(c)<\/p>\n

arr = np.ones([3,6])
\n# \u6570\u7ec4\u7684\u5206\u5272，\u53ef\u4ee5\u6307\u5b9a\u6574\u6570\u6216\u4e0b\u6807\u7684\u5217\u8868
\nb, c, d = np.split(arr, [1,2], axis=1)
\nprint(b)
\nprint(c)
\nprint(d)<\/p>\n

（3）where<\/span>\u51fd\u6570<\/h3>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0numpy.where\u662f NumPy \u5e93\u4e2d\u7684\u4e00\u4e2a\u51fd\u6570，\u5b83\u53ef\u4ee5\u6839\u636e\u6307\u5b9a\u7684\u6761\u4ef6\u8fd4\u56de\u6ee1\u8db3\u8be5\u6761\u4ef6\u7684\u5143\u7d20\u7684\u7d22\u5f15\u3002<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5f53 numpy.where \u63a5\u53d7\u4e00\u4e2a\u6761\u4ef6\u4f5c\u4e3a\u53c2\u6570\u65f6，\u5b83\u4f1a\u8fd4\u56de\u4e00\u4e2a\u5143\u7ec4，\u6bcf\u4e2a\u5143\u7d20\u662f\u4e00\u4e2anumpy\u6570\u7ec4，\u5176\u4e2d\u5305\u542b\u6ee1\u8db3\u8be5\u6761\u4ef6\u7684\u5143\u7d20\u7684\u7d22\u5f15（\u884c\u7d22\u5f15\u3001\u5217\u7d22\u5f15）\u3002<\/span><\/p>\n

numpy<\/span>.<\/span>where<\/span>(<\/span>condition<\/span>)<\/span><\/p>\n

\u53c2\u6570：\u4e00\u4e2a\u5e03\u5c14\u6570\u7ec4\u6216\u6761\u4ef6\u8868\u8fbe\u5f0f<\/span><\/p>\n

\u8fd4\u56de\u503c：\u4e00\u4e2a\u5143\u7ec4，\u5176\u4e2d\u5305\u542b\u6ee1\u8db3\u6761\u4ef6\u7684\u5143\u7d20\u7684\u7d22\u5f15<\/span><\/p>\n

import numpy as np
\narr = np.array([4,6,6,3,5,2,9])
\ncond = arr>4
\n# \u8fd4\u56debool\u6570\u7ec4
\nprint(cond)
\nret = np.where(cond)
\n# \u8fd4\u56de\u4e3a\u771f\u7684\u4e0b\u6807
\nprint(ret)
\n# \u901a\u8fc7\u4e0b\u6807\u8fd4\u56de\u503c
\nprint(arr[ret])<\/p>\n<\/p>\n<\/p>\n<\/p>\n<\/p>\n<\/p>\n<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"

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