Python擴充套件庫numpy中where()函式的三種用法 Python擴充套件庫numpy中where()函式的三種用法
阿新 • • 發佈:2018-11-16
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Python擴充套件庫numpy中where()函式的三種用法
2018年06月25日 07:43:56 Python_小屋 閱讀數:1000</div> <div class="operating"> </div> </div> </div> </div> <article> <div id="article_content" class="article_content clearfix csdn-tracking-statistics" data-pid="blog" data-mod="popu_307" data-dsm="post"> <div class="article-copyright"> 版權宣告:本文為博主原創文章,未經博主允許不得轉載。 https://blog.csdn.net/oh5W6HinUg43JvRhhB/article/details/80796594 </div> <link rel="stylesheet" href="https://csdnimg.cn/release/phoenix/template/css/ck_htmledit_views-f76675cdea.css"> <div class="htmledit_views"> <div class="rich_media_content"> <p style="line-height:2em;text-indent:2em;"><span style="font-size:18px;">第一種用法:只給where()函式傳遞一個數組作為引數,返回其中非0元素的下標。</span></p><p style="line-height:2em;"><img src="https://ss.csdn.net/p?https://mmbiz.qpic.cn/mmbiz_png/xXrickrc6JTNtC321Iic2PENiaeoahn7AuDPyr3TrBsEibKmj7yO0R5oicUeID3lc2ClLEGWRpuBMaYHFUGUib8JOaEA/640?wx_fmt=png" alt="640?wx_fmt=png"></p><p style="line-height:2em;text-indent:2em;"><span style="font-size:18px;">第二種用法:給where()函式傳遞一個包含True/False值的陣列,返回該陣列中True值的下標,結合numpy陣列的關係運算,可以返回陣列中符合特定條件的元素的下標。</span></p><p style="line-height:2em;"><img src="https://ss.csdn.net/p?https://mmbiz.qpic.cn/mmbiz_png/xXrickrc6JTNtC321Iic2PENiaeoahn7AuDxeCauWCfKbiaxE7MAcIKh3R5xkAYxKbib8VpYNPpWG6JkMksXnEP4n6A/640?wx_fmt=png" alt="640?wx_fmt=png"></p><p style="line-height:2em;text-indent:2em;"><span style="font-size:18px;">第三種用法:給where()函式傳遞一個條件陣列和兩個值或陣列,對於條件陣列中等價於True的位置,從第一個值或陣列中取值進行替換,否則從第二個值或陣列中取值進行替換。</span></p><p style="line-height:2em;"><img src="https://ss.csdn.net/p?https://mmbiz.qpic.cn/mmbiz_png/xXrickrc6JTNtC321Iic2PENiaeoahn7AuD8kfXpibmknw3EpicnjlZNyracJAC0x9xuLo9U6sAia5dxqyT0pgmyDknA/640?wx_fmt=png" alt="640?wx_fmt=png"></p><p><br></p><p><br></p><p style="background-color:transparent;clear:both;color:rgb(51,51,51);"><span 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