{"id":1668,"date":"2020-06-22T04:23:34","date_gmt":"2020-06-21T20:23:34","guid":{"rendered":"http:\/\/39.97.231.10\/?p=1668"},"modified":"2020-06-22T04:23:34","modified_gmt":"2020-06-21T20:23:34","slug":"numpy%e8%bf%9b%e9%98%b6%e4%b9%8b%e6%8e%92%e5%ba%8f%e5%b0%8f%e6%8a%80%e5%b7%a7","status":"publish","type":"post","link":"http:\/\/www.weijing.co\/?p=1668","title":{"rendered":"Numpy\u8fdb\u9636\u4e4b\u6392\u5e8f\u5c0f\u6280\u5de7"},"content":{"rendered":"<div>\n<div>\n<div>\n<div>Numpy\u63d0\u4f9b\u5927\u91cf\u7528\u6570\u7ec4\u64cd\u4f5c\u7684\u51fd\u6570\uff0c\u5176\u4e2d\u4e0d\u4e4f\u5e38\u89c1\u7684\u6392\u5e8f\u51fd\u6570\u3002<\/div>\n<\/div>\n<\/div>\n<\/div>\n<article>\u8fd9\u91cc\u8bb2\u4e00\u4e0bnumpy.sort\u3001numpy.argsort\u3001numpy.lexsort\u4e09\u79cd\u6392\u5e8f\u51fd\u6570\u7684\u7528\u6cd5\u3002<\/p>\n<h3>1\u3001\u5982\u4f55\u5bf9\u6570\u7ec4\u5143\u7d20\u8fdb\u884c\u5feb\u901f\u6392\u5e8f\uff1f<\/h3>\n<p>\u4f7f\u7528numpy.sort\u51fd\u6570\u53ef\u4ee5\u5bf9\u6570\u7ec4\u8fdb\u884c\u6392\u5e8f\uff0c\u5e76\u8fd4\u56de\u6392\u5e8f\u597d\u7684\u6570\u7ec4\u3002<br \/>\n\u4f7f\u7528\u65b9\u6cd5\uff1a<br \/>\nnumpy.sort(a, axis=-1, kind=None, order=None)<br \/>\n\u53c2\u6570\uff1a<\/p>\n<ul>\n<li>a : \u8981\u6392\u5e8f\u7684\u6570\u7ec4\uff1b<\/li>\n<li>axis \uff1a \u6309\u4ec0\u4e48\u8f74\u8fdb\u884c\u6392\u5e8f\uff0c\u9ed8\u8ba4\u6309\u6700\u540e\u4e00\u4e2a\u8f74\u8fdb\u884c\u6392\u5e8f\uff1b<\/li>\n<li>kind \uff1a\u6392\u5e8f\u65b9\u6cd5\uff0c\u9ed8\u8ba4\u662f\u5feb\u901f\u6392\u5e8f\uff1b<\/li>\n<li>order : \u5f53\u6570\u7ec4\u5b9a\u4e49\u4e86\u5b57\u6bb5\u5c5e\u6027\u65f6\uff0c\u53ef\u4ee5\u6309\u7167\u67d0\u4e2a\u5c5e\u6027\u8fdb\u884c\u6392\u5e8f\uff1b<\/li>\n<\/ul>\n<div>\n<pre>import numpy as np\n# \u521b\u5efa\u4e00\u4e2a\u4e00\u7ef4\u6570\u7ec4\nx1 = np.array([1,8,2,4])\nx1\n\\'\\'\\'\n\u4e00\u7ef4\u6570\u7ec4\uff1a\narray([1, 8, 2, 4])\n\\'\\'\\'\n# \u6392\u5e8f\nnp.sort(x1)\n\\'\\'\\'\n\u8f93\u51fa\uff1a\narray([1, 2, 4, 8])\n\\'\\'\\'\nimport numpy as np\n# \u521b\u5efa\u4e00\u4e2a\u4e8c\u7ef4\u6570\u7ec4\nx2 = np.array([[1,8,2,4],[4,5,1,3]])\nx2\n\\'\\'\\'\n\u4e8c\u7ef4\u6570\u7ec4\uff1a\narray([[1, 8, 2, 4],\n       [4, 5, 1, 3]])\n\\'\\'\\'\n# \u9ed8\u8ba4\u6309\u6700\u540e\u4e00\u4e2a\u8f74\u6392\u5e8f\uff0c\u8fd9\u91cc\u6309\u884c\u6392\u5e8f\nnp.sort(x2)\n\\'\\'\\'\n\u8f93\u51fa\uff1a\narray([[1, 2, 4, 8],\n       [1, 3, 4, 5]])\n\\'\\'\\'\n# \u8f74\u8bbe\u4e3a0\uff0c\u5373\u6309\u5217\u6392\u5e8f\nnp.sort(x2,axis=0)\n\\'\\'\\'\n\u8f93\u51fa\uff1a\narray([[1, 5, 1, 3],\n       [4, 8, 2, 4]])\n\\'\\'\\'\n<\/pre>\n<\/div>\n<p>\u4e0b\u9762\u8bd5\u4e0b\u6309\u7167\u5b57\u6bb5\u5c5e\u6027\u8fdb\u884c\u6392\u5e8f\uff0c\u9700\u8981\u7528\u5230order\u53c2\u6570\u3002<\/p>\n<div>\n<pre>import numpy as np\n# \u8fd9\u662f\u4e00\u4e2a\u540d\u5b57\u3001\u8eab\u9ad8\u3001\u5e74\u9f84\u7684\u6570\u7ec4\n# \u5148\u7ed9\u5404\u5b57\u6bb5\u914d\u7f6e\u5c5e\u6027\u7c7b\u578b\ndtype = [(\\'Name\\', \\'S10\\'), (\\'Height\\', float), (\\'Age\\', int)]\n# \u5404\u5b57\u6bb5\u503c\nvalues = [(\\'Li\\', 1.8, 41), (\\'Wang\\', 1.9, 38),(\\'Duan\\', 1.7, 38)]\n# \u521b\u5efa\u6570\u7ec4\na = np.array(values, dtype=dtype)\na\n\\'\\'\\'\n\u6570\u7ec4\uff1a\narray([(b\\'Li\\', 1.8, 41), (b\\'Wang\\', 1.9, 38), (b\\'Duan\\', 1.7, 38)],\n      dtype=[(\\'Name\\', \\'S10\\'), (\\'Height\\', \\'&lt;f8\\'), (\\'Age\\', \\'&lt;i4\\')])\n\\'\\'\\'\n# \u6309\u7167\u5c5e\u6027Height\u8fdb\u884c\u6392\u5e8f,\u6b64\u65f6\u53c2\u6570\u4e3a\u5b57\u7b26\u4e32\nnp.sort(a, order=\\'Height\\')\n\\'\\'\\'\n\u8f93\u51fa\uff1a\narray([(b\\'Duan\\', 1.7, 38), (b\\'Li\\', 1.8, 41), (b\\'Wang\\', 1.9, 38)],\n      dtype=[(\\'Name\\', \\'S10\\'), (\\'Height\\', \\'&lt;f8\\'), (\\'Age\\', \\'&lt;i4\\')])\n\\'\\'\\'\n# \u5148\u6309\u7167\u5c5e\u6027Age\u6392\u5e8f,\u5982\u679cAge\u76f8\u7b49\uff0c\u518d\u6309\u7167Height\u6392\u5e8f\uff0c\u6b64\u65f6\u53c2\u6570\u4e3a\u5217\u8868\nnp.sort(a, order=[\\'Age\\', \\'Height\\'])\n\\'\\'\\'\n\u8f93\u51fa\uff1a\narray([(b\\'Duan\\', 1.7, 38), (b\\'Wang\\', 1.9, 38), (b\\'Li\\', 1.8, 41)],\n      dtype=[(\\'Name\\', \\'S10\\'), (\\'Height\\', \\'&lt;f8\\'), (\\'Age\\', \\'&lt;i4\\')])\n\\'\\'\\'\n<\/pre>\n<\/div>\n<h3>2\u3001\u5982\u4f55\u83b7\u53d6\u6570\u7ec4\u5143\u7d20\u6392\u5e8f\u540e\u7684\u7d22\u5f15\uff1f<\/h3>\n<p>numpy.argsort\u51fd\u6570\u7528\u4e8e\u5c06\u6570\u7ec4\u6392\u5e8f\u540e\uff0c\u8fd4\u56de\u6570\u7ec4\u5143\u7d20\u4ece\u5c0f\u5230\u5927\u4f9d\u6b21\u6392\u5e8f\u7684\u6240\u6709\u5143\u7d20\u7d22\u5f15\u3002<br \/>\n\u4f7f\u7528\u65b9\u6cd5\uff08\u548csort\u7c7b\u4f3c\uff09\uff1a<br \/>\nnumpy.argsort(a, axis=-1, kind=None, order=None)<br \/>\n\u53c2\u6570\uff1a<\/p>\n<ul>\n<li>a : \u8981\u6392\u5e8f\u7684\u6570\u7ec4\uff1b<\/li>\n<li>axis \uff1a \u6309\u4ec0\u4e48\u8f74\u8fdb\u884c\u6392\u5e8f\uff0c\u9ed8\u8ba4\u6309\u6700\u540e\u4e00\u4e2a\u8f74\u8fdb\u884c\u6392\u5e8f\uff1b<\/li>\n<li>kind \uff1a\u6392\u5e8f\u65b9\u6cd5\uff0c\u9ed8\u8ba4\u662f\u5feb\u901f\u6392\u5e8f\uff1b<\/li>\n<li>order : \u5f53\u6570\u7ec4\u5b9a\u4e49\u4e86\u5b57\u6bb5\u5c5e\u6027\u65f6\uff0c\u53ef\u4ee5\u6309\u7167\u67d0\u4e2a\u5c5e\u6027\u8fdb\u884c\u6392\u5e8f\uff1b<\/li>\n<\/ul>\n<div>\n<pre>import numpy as np\n# \u521b\u5efa\u4e00\u7ef4\u6570\u7ec4\nx = np.array([3, 1, 2])\n\\'\\'\\'\n\u6570\u7ec4\uff1a\narray([3, 1, 2])\n\\'\\'\\'\n# \u83b7\u53d6\u6392\u5e8f\u540e\u7684\u7d22\u5f15\nnp.argsort(x)\n\\'\\'\\'\n\u8f93\u51fa\uff1a\narray([1, 2, 0], dtype=int64)\n\\'\\'\\'\nimport numpy as np\n# \u521b\u5efa\u4e8c\u7ef4\u6570\u7ec4\nx2 = np.array([[0, 3], [2, 2]])\n\\'\\'\\'\n\u6570\u7ec4\uff1a\narray([[0, 3],\n       [2, 2]])\n\\'\\'\\'\n# \u9ed8\u8ba4\u6309\u7167\u6700\u540e\u4e00\u4e2a\u8f74\u8fdb\u884c\u6392\u5e8f\uff0c\u5373\u884c\u6392\u5e8f\n# \u83b7\u53d6\u6392\u5e8f\u540e\u7684\u7d22\u5f15\nnp.argsort(x2)\n\\'\\'\\'\n\u8f93\u51fa\uff1a\narray([[0, 1],\n       [0, 1]], dtype=int64)\n\\'\\'\\'\n<\/pre>\n<\/div>\n<p>\u6309\u5b57\u6bb5\u5c5e\u6027\u8fdb\u884c\u6392\u5e8f\uff0c\u5e76\u83b7\u53d6\u7d22\u5f15\u3002<\/p>\n<div>\n<pre># \u5148\u7ed9\u5404\u5b57\u6bb5\u914d\u7f6e\u5c5e\u6027\u7c7b\u578b\ndtype = [(\\'name\\', str), (\\'age\\', int)]\n# \u503c\nvalues = [(\\'Anna\\', 28), (\\'Bob\\', 27),(\\'Brown\\',21)]\n# \u521b\u5efa\u6570\u7ec4\nx = np.array(values, dtype=dtype)\nx\n\\'\\'\\'\n\u6570\u7ec4\uff1a\narray([(\\'\\', 28), (\\'\\', 27), (\\'\\', 21)],\n      dtype=[(\\'name\\', \\'&lt;U\\'), (\\'age\\', \\'&lt;i4\\')])\n\\'\\'\\'\n# \u5148\u6309\u7167\u5c5e\u6027name\u6392\u5e8f,\u5982\u679cname\u76f8\u7b49\uff0c\u518d\u6309\u7167age\u6392\u5e8f\nnp.argsort(x,order=[\\'name\\',\\'age\\'])\n\\'\\'\\'\n\u8f93\u51fa\uff1a\narray([2, 1, 0], dtype=int64)\n\\'\\'\\'\n<\/pre>\n<\/div>\n<h3>3\u3001\u5982\u4f55\u6309\u591a\u6761\u4ef6\u8fdb\u884c\u6392\u5e8f\uff1f<\/h3>\n<blockquote><p>\u8fd9\u91cc\u4e3e\u4e00\u4e2a\u5e94\u7528\u573a\u666f\uff1a\u5c0f\u5347\u521d\u8003\u8bd5\uff0c\u91cd\u70b9\u73ed\u5f55\u53d6\u5b66\u751f\u6309\u7167\u603b\u6210\u7ee9\u5f55\u53d6\u3002\u5728\u603b\u6210\u7ee9\u76f8\u540c\u65f6\uff0c\u6570\u5b66\u6210\u7ee9\u9ad8\u7684\u4f18\u5148\u5f55\u53d6\uff0c\u5728\u603b\u6210\u7ee9\u548c\u6570\u5b66\u6210\u7ee9\u90fd\u76f8\u540c\u65f6\uff0c\u6309\u7167\u82f1\u8bed\u6210\u7ee9\u5f55\u53d6\u2026\u2026 \u8fd9\u91cc\uff0c\u603b\u6210\u7ee9\u6392\u5728\u7535\u5b50\u8868\u683c\u7684\u6700\u540e\u4e00\u5217\uff0c\u6570\u5b66\u6210\u7ee9\u5728\u5012\u6570\u7b2c\u4e8c\u5217\uff0c\u82f1\u8bed\u6210\u7ee9\u5728\u5012\u6570\u7b2c\u4e09\u5217\u3002<\/p><\/blockquote>\n<p>numpy.lexsort\u51fd\u6570\u7528\u4e8e\u6309\u7167\u591a\u4e2a\u6761\u4ef6\uff08\u952e\uff09\u8fdb\u884c\u6392\u5e8f\uff0c\u8fd4\u56de\u6392\u5e8f\u540e\u7d22\u5f15\u3002<br \/>\n\u4f7f\u7528\u65b9\u6cd5\uff1a<br \/>\nnumpy.lexsort(keys, axis=-1)<br \/>\n\u53c2\u6570\uff1a<\/p>\n<ul>\n<li>keys \uff1a\u5e8f\u5217\u6216\u5143\u7ec4\uff0c\u8981\u6392\u5e8f\u7684\u4e0d\u540c\u7684\u5217\uff1b<\/li>\n<li>axis \uff1a\u6cbf\u6307\u5b9a\u8f74\u8fdb\u884c\u6392\u5e8f\uff1b<\/li>\n<\/ul>\n<p>\u8bf4\u660e\uff1a<br \/>\n\u4f7f\u7528\u952e\u5e8f\u5217\u6267\u884c\u95f4\u63a5\u7a33\u5b9a\u6392\u5e8f\u3002<br \/>\n\u7ed9\u5b9a\u591a\u4e2a\u6392\u5e8f\u952e\uff08\u53ef\u4ee5\u5c06\u5176\u89e3\u91ca\u4e3a\u7535\u5b50\u8868\u683c\u4e2d\u7684\u5217\uff09\uff0clexsort\u8fd4\u56de\u4e00\u4e2a\u6574\u6570\u7d22\u5f15\u6570\u7ec4\uff0c\u8be5\u6570\u7ec4\u63cf\u8ff0\u6309\u591a\u4e2a\u5217\u6392\u5e8f\u7684\u987a\u5e8f\u3002<br \/>\n\u5e8f\u5217\u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u952e\u7528\u4e8e\u4e3b\u6392\u5e8f\u987a\u5e8f\uff0c\u5012\u6570\u7b2c\u4e8c\u4e2a\u952e\u7528\u4e8e\u8f85\u52a9\u6392\u5e8f\u987a\u5e8f\uff0c\u4f9d\u6b64\u7c7b\u63a8\u3002<br \/>\nkeys\u53c2\u6570\u5fc5\u987b\u662f\u53ef\u4ee5\u8f6c\u6362\u4e3a\u76f8\u540c\u5f62\u72b6\u7684\u6570\u7ec4\u7684\u5bf9\u8c61\u5e8f\u5217\u3002<br \/>\n\u5982\u679c\u4e3akeys\u53c2\u6570\u63d0\u4f9b\u4e862D\u6570\u7ec4\uff0c\u5219\u5c06\u5176\u884c\u89e3\u91ca\u4e3a\u6392\u5e8f\u952e\uff0c\u5e76\u6839\u636e\u6700\u540e\u4e00\u884c\uff0c\u5012\u6570\u7b2c\u4e8c\u884c\u7b49\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n<div>\n<pre>import numpy as np\n# \u82f1\u8bed\u6210\u7ee9\neng = [90,85,95,80]\n# \u6570\u5b66\u6210\u7ee9\nmath = [80,95,90,85]\n# \u603b\u6210\u7ee9\ntotal = [170,170,185,165]\n# \u6392\u5e8f\uff0c\u83b7\u53d6\u7d22\u5f15\nnp.lexsort((eng,math,total))\n\\'\\'\\'\n\u5148\u6309\u603b\u6210\u7ee9total\u8fdb\u884c\u6392\u5e8f\uff0c\n\u518d\u6309\u6570\u5b66\u6210\u7ee9math\u8fdb\u884c\u6392\u5e8f\uff0c\n\u6700\u540e\u6309\u82f1\u8bed\u6210\u7ee9\u8fdb\u884c\u6392\u5e8f\u3002\n\u53ef\u4ee5\u770b\u5230total\u91cc\u6709\u4e24\u4e2a170\uff0c\n\u8fd9\u65f6\u5019\u5c31\u6309\u4e0b\u4e00\u7ea7math\u6392\u5e8f\uff0c\n\u6700\u540e\u83b7\u53d6\u6392\u5e8f\u540e\u7684\u7d22\u5f15\n\u8f93\u51fa\uff1a\narray([3, 0, 1, 2], dtype=int64)\n\\'\\'\\'\n# \u4e5f\u53ef\u4ee5\u76f4\u63a5\u4f20\u5165\u6570\u7ec4\nscore = np.array([[90,85,95,80],[80,95,90,85],[170,170,185,165]])\nnp.lexsort(score)\n\\'\\'\\'\n\u8f93\u51fa\uff1a\narray([3, 0, 1, 2], dtype=int64)\n\\'\\'\\'<\/pre>\n<\/div>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>Numpy\u63d0\u4f9b\u5927\u91cf\u7528\u6570\u7ec4\u64cd\u4f5c\u7684\u51fd\u6570\uff0c\u5176\u4e2d\u4e0d\u4e4f\u5e38\u89c1\u7684\u6392\u5e8f\u51fd\u6570\u3002 \u8fd9\u91cc\u8bb2\u4e00\u4e0bnumpy.sort\u3001numpy.ar &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"http:\/\/www.weijing.co\/?p=1668\"> <span class=\"screen-reader-text\">Numpy\u8fdb\u9636\u4e4b\u6392\u5e8f\u5c0f\u6280\u5de7<\/span> \u67e5\u770b\u5168\u6587 &raquo;<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"categories":[106,126],"tags":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"mailpoet_newsletter_max":false,"woocommerce_thumbnail":false,"woocommerce_single":false,"woocommerce_gallery_thumbnail":false,"shop_catalog":false,"shop_single":false,"shop_thumbnail":false},"uagb_author_info":{"display_name":"weijing","author_link":"http:\/\/www.weijing.co\/?author=4"},"uagb_comment_info":0,"uagb_excerpt":"Numpy\u63d0\u4f9b\u5927\u91cf\u7528\u6570\u7ec4\u64cd\u4f5c\u7684\u51fd\u6570\uff0c\u5176\u4e2d\u4e0d\u4e4f\u5e38\u89c1\u7684\u6392\u5e8f\u51fd\u6570\u3002 \u8fd9\u91cc\u8bb2\u4e00\u4e0bnumpy.sort\u3001numpy.ar&hellip;","_links":{"self":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/1668"}],"collection":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1668"}],"version-history":[{"count":0,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/1668\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1668"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1668"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1668"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}