{"id":3382,"date":"2022-02-27T15:34:07","date_gmt":"2022-02-27T07:34:07","guid":{"rendered":"https:\/\/egonlin.com\/?p=3382"},"modified":"2022-02-27T15:34:07","modified_gmt":"2022-02-27T07:34:07","slug":"%e7%ac%ac%e5%85%ab%e7%af%87%ef%bc%9a%e5%be%ae%e7%a7%af%e5%88%86-sign%e7%ac%a6%e5%8f%b7%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=3382","title":{"rendered":"\u7b2c\u516b\u7bc7\uff1a\u5fae\u79ef\u5206-sign(\u7b26\u53f7)\u51fd\u6570"},"content":{"rendered":"

sign(\u7b26\u53f7)\u51fd\u6570<\/h1>\n

sign\u51fd\u6570\u6982\u8ff0<\/h1>\n

  sign\u51fd\u6570\u4e5f\u79f0\u4f5c\u7b26\u53f7\u51fd\u6570\uff0c\u5f53x>0\u7684\u65f6\u5019y=1\uff1b\u5f53x=0\u7684\u65f6\u5019y=0\uff1b\u5f53x<0\u7684\u65f6\u5019y=-1\u3002sign\u51fd\u6570\u516c\u5f0f\u4e3a
\n$$
\ny = \\begin{cases}
\n1,\\quad x>0 \\
\n0,\\quad x=0 \\
\n-1,\\quad x<0 \\
\n\\end{cases}
\n$$<\/p>\n

python\u5b9e\u73b0sign\u51fd\u6570<\/h1>\n
import matplotlib.pyplot as plt\nimport numpy as np\n%matplotlib inline\n\nx_list = [i for i in range(-100, 100)]\ny_list = np.sign(x_list)\n\nplt.figure()\nplt.plot(x_list, y_list, color='k')\nplt.plot(0, 0, color='r', marker='o')\nplt.xlabel('x')\nplt.ylabel('y')\nplt.show()<\/code><\/pre>\n
\"\"<\/div><\/p>\n
<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
sign(\u7b26\u53f7)\u51fd\u6570 sign\u51fd\u6570\u6982\u8ff0   sign\u51fd\u6570\u4e5f\u79f0\u4f5c\u7b26\u53f7\u51fd\u6570\uff0c\u5f53x>0\u7684\u65f6 […]<\/p>\n","protected":false},"author":3,"featured_media":3360,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[276,303,305],"tags":[],"_links":{"self":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/3382"}],"collection":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3382"}],"version-history":[{"count":0,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/3382\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/media\/3360"}],"wp:attachment":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3382"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3382"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3382"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}