{"id":113434,"date":"2026-10-06T10:49:42","date_gmt":"2026-10-06T02:49:42","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/113434.html"},"modified":"2026-10-06T10:49:42","modified_gmt":"2026-10-06T02:49:42","slug":"%e7%ac%ac-17-%e7%ab%a0-%c2%b7-%e7%9f%a9%e9%98%b5%e8%bf%90%e7%ae%97","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/113434.html","title":{"rendered":"\u7b2c 17 \u7ae0 \u00b7 \u77e9\u9635\u8fd0\u7b97"},"content":{"rendered":"<p>\u5b66\u4f1a\u77e9\u9635\u7684&#034;\u56db\u5219\u8fd0\u7b97&#034;\u3002\u5176\u4e2d\u77e9\u9635\u4e58\u6cd5\u662f\u6700\u91cd\u8981\u4e5f\u6700\u5bb9\u6613\u641e\u6df7\u7684&#xff0c;\u672c\u7ae0\u91cd\u70b9\u8bb2\u900f\u3002<\/p>\n<h3>17.1 \u77e9\u9635\u52a0\u51cf&#xff1a;\u5bf9\u5e94\u5143\u7d20\u76f8\u52a0\u51cf<\/h3>\n<p>\u4e24\u4e2a\u5c3a\u5bf8\u76f8\u540c\u7684\u77e9\u9635&#xff0c;\u5bf9\u5e94\u4f4d\u7f6e\u7684\u5143\u7d20\u76f8\u52a0\u51cf&#xff1a;<\/p>\n<p>[ 1 2 ]   [ 5 6 ]   [ 1&#043;5  2&#043;6 ]   [ 6  8 ]<br \/>\n[ 3 4 ] &#043; [ 7 8 ] &#061; [ 3&#043;7  4&#043;8 ] &#061; [ 10 12 ]<\/p>\n<p>\u89c4\u5219&#xff1a;\u540c\u884c\u540c\u5217\u7684\u5143\u7d20\u76f8\u52a0\u3002\u51cf\u6cd5\u540c\u7406\u3002<\/p>\n<h3>17.2 \u6570\u4e58&#xff1a;\u6bcf\u4e2a\u5143\u7d20\u90fd\u4e58\u4e00\u4e2a\u6570<\/h3>\n<p>\u4e00\u4e2a\u6807\u91cf\u4e58\u77e9\u9635&#xff0c;\u7b49\u4e8e\u77e9\u9635\u6bcf\u4e2a\u5143\u7d20\u90fd\u4e58\u8fd9\u4e2a\u6807\u91cf&#xff1a;<\/p>\n<p>     [ 1 2 ]   [ 2 4 ]<br \/>\n2 \u00d7  [ 3 4 ] &#061; [ 6 8 ]<\/p>\n<h3>17.3 \u8f6c\u7f6e&#xff1a;\u884c\u5217\u4e92\u6362<\/h3>\n<p>\u8f6c\u7f6e&#xff08;transpose&#xff09; \u628a\u77e9\u9635&#034;\u6cbf\u5bf9\u89d2\u7ebf\u7ffb\u8f6c&#034;&#xff1a;\u884c\u53d8\u5217\u3001\u5217\u53d8\u884c\u3002<\/p>\n<p>     [ 1 2 3 ]        [ 1 4 ]<br \/>\nA &#061;  [ 4 5 6 ]   A\u1d40 &#061; [ 2 5 ]<br \/>\n                      [ 3 6 ]<\/p>\n<p>\u7b2c i \u884c\u53d8\u6210\u7b2c i \u5217\u3002A \u7684\u8f6c\u7f6e\u8bb0\u4f5c A\u1d40&#xff08;\u6216 A.transpose()&#xff09;\u3002<\/p>\n<p>\u5bf9\u79f0\u77e9\u9635\u5c31\u662f&#034;\u8f6c\u7f6e\u7b49\u4e8e\u81ea\u5df1&#034;\u7684\u77e9\u9635&#xff08;A\u1d40 &#061; A&#xff09;\u3002<\/p>\n<h3>17.4 \u70b9\u79ef&#xff08;\u5185\u79ef&#xff09;&#xff1a;\u4e24\u4e2a\u5411\u91cf\u7684&#034;\u76f8\u4f3c\u5ea6&#034;<\/h3>\n<p>\u4e24\u4e2a\u540c\u7ef4\u5411\u91cf\u7684\u70b9\u79ef&#xff08;dot product&#xff09;&#xff1a;\u5bf9\u5e94\u5206\u91cf\u76f8\u4e58\u518d\u6c42\u548c\u3002<\/p>\n<p>(1, 2, 3) \u00b7 (4, 5, 6) &#061; 1\u00d74 &#043; 2\u00d75 &#043; 3\u00d76 &#061; 4 &#043; 10 &#043; 18 &#061; 32<\/p>\n<p>\u70b9\u79ef\u7684\u610f\u4e49&#xff1a;<\/p>\n<ul>\n<li>\u70b9\u79ef &#061; 0&#xff0c;\u4e24\u4e2a\u5411\u91cf\u5782\u76f4&#xff08;\u6b63\u4ea4&#xff09;<\/li>\n<li>\u70b9\u79ef &#061; \u4e24\u5411\u91cf\u957f\u5ea6\u4e58\u79ef&#xff0c;\u5219\u540c\u5411<\/li>\n<li>\u70b9\u79ef &lt; 0&#xff0c;\u65b9\u5411\u5927\u81f4\u76f8\u53cd<\/li>\n<\/ul>\n<p>\u70b9\u79ef\u662f\u8861\u91cf&#034;\u4e24\u4e2a\u5411\u91cf\u6709\u591a\u50cf&#034;\u7684\u5de5\u5177&#xff0c;\u5728\u673a\u5668\u5b66\u4e60\u3001\u7269\u7406\u91cc\u65e0\u5904\u4e0d\u5728\u3002<\/p>\n<h3>17.5 \u77e9\u9635\u4e58\u6cd5&#xff08;\u91cd\u70b9&#xff01;&#xff09;<\/h3>\n<p>\u8fd9\u662f\u6700\u91cd\u8981\u7684\u8fd0\u7b97&#xff0c;\u89c4\u5219\u9700\u8981\u8bb0\u7262\u3002<\/p>\n<h4>\u89c4\u5219<\/h4>\n<p>\u4e24\u4e2a\u77e9\u9635 A&#xff08;m\u00d7n&#xff09;\u548c B&#xff08;n\u00d7p&#xff09;\u76f8\u4e58&#xff0c;\u5f97\u5230 C&#xff08;m\u00d7p&#xff09;&#xff1a;<\/p>\n<ul>\n<li>A \u7684\u5217\u6570\u5fc5\u987b\u7b49\u4e8e B \u7684\u884c\u6570&#xff08;\u90fd\u662f n&#xff09;<\/li>\n<li>\u7ed3\u679c C \u7684\u7b2c i \u884c\u7b2c j \u5217 &#061; A \u7684\u7b2c i \u884c \u4e0e B \u7684\u7b2c j \u5217 \u7684\u70b9\u79ef<\/li>\n<\/ul>\n<h4>\u4f8b\u5b50<\/h4>\n<p>A &#061; [ 1 2 ]     B &#061; [ 5 6 ]<br \/>\n    [ 3 4 ]         [ 7 8 ]<\/p>\n<p>A \u662f 2\u00d72&#xff0c;B \u662f 2\u00d72&#xff0c;\u7ed3\u679c C \u662f 2\u00d72\u3002<\/p>\n<p>\u7b97 C(0,0)&#xff1a;A \u7b2c 1 \u884c (1,2) \u00b7 B \u7b2c 1 \u5217 (5,7) &#061; 1\u00d75 &#043; 2\u00d77 &#061; 19<\/p>\n<p>\u7b97 C(0,1)&#xff1a;A \u7b2c 1 \u884c (1,2) \u00b7 B \u7b2c 2 \u5217 (6,8) &#061; 1\u00d76 &#043; 2\u00d78 &#061; 22<\/p>\n<p>\u7b97 C(1,0)&#xff1a;A \u7b2c 2 \u884c (3,4) \u00b7 B \u7b2c 1 \u5217 (5,7) &#061; 3\u00d75 &#043; 4\u00d77 &#061; 43<\/p>\n<p>\u7b97 C(1,1)&#xff1a;A \u7b2c 2 \u884c (3,4) \u00b7 B \u7b2c 2 \u5217 (6,8) &#061; 3\u00d76 &#043; 4\u00d78 &#061; 50<\/p>\n<p>C &#061; [ 19 22 ]<br \/>\n    [ 43 50 ]<\/p>\n<h4>\u77e9\u9635 \u00d7 \u5411\u91cf<\/h4>\n<p>\u5411\u91cf\u662f&#034;\u53ea\u6709\u4e00\u5217\u7684\u77e9\u9635&#034;&#xff0c;\u6240\u4ee5\u77e9\u9635\u4e58\u5411\u91cf\u662f\u77e9\u9635\u4e58\u6cd5\u7684\u7279\u6b8a\u60c5\u51b5&#xff1a;<\/p>\n<p>[ 1 2 ]   [ 1 ]   [ 1\u00d71 &#043; 2\u00d71 ]   [ 3 ]<br \/>\n[ 3 4 ] \u00d7 [ 1 ] &#061; [ 3\u00d71 &#043; 4\u00d71 ] &#061; [ 7 ]<\/p>\n<p>\u77e9\u9635\u4e58\u5411\u91cf &#061; \u5bf9\u5411\u91cf\u505a\u4e00\u6b21&#034;\u53d8\u6362&#034;&#xff08;\u7b2c 21 \u7ae0\u4f1a\u5c55\u5f00&#xff0c;\u8fd9\u662f\u7406\u89e3\u51e0\u4f55\u7684\u5173\u952e&#xff09;\u3002<\/p>\n<h4>\u5173\u952e\u6027\u8d28&#xff1a;\u4e0d\u6ee1\u8db3\u4ea4\u6362\u5f8b&#xff01;<\/h4>\n<p>\u77e9\u9635\u4e58\u6cd5\u4e0d\u6ee1\u8db3\u4ea4\u6362\u5f8b&#xff1a;A\u00d7B \u2260 B\u00d7A&#xff08;\u5927\u591a\u6570\u60c5\u51b5\u4e0b&#xff09;\u3002<\/p>\n<p>\u800c\u4e14\u987a\u5e8f\u5f71\u54cd\u5c3a\u5bf8&#xff1a;2\u00d73 \u4e58 3\u00d74 \u53ef\u4ee5&#xff08;\u5f97 2\u00d74&#xff09;&#xff0c;\u4f46 3\u00d74 \u4e58 2\u00d73 \u4e0d\u884c&#xff08;\u5217\u6570\u4e0d\u7b49\u4e8e\u884c\u6570&#xff09;\u3002<\/p>\n<p>\u8bb0\u5fc6&#xff1a;\u77e9\u9635\u4e58\u6cd5&#034;\u5de6\u77e9\u9635\u7684\u5217 &#061; \u53f3\u77e9\u9635\u7684\u884c&#034;\u624d\u80fd\u4e58&#xff1b;\u7ed3\u679c\u5c3a\u5bf8 &#061; \u201c\u5de6\u884c \u00d7 \u53f3\u5217\u201d\u3002<\/p>\n<h3>17.6 \u5728 Eigen \u91cc\u505a\u77e9\u9635\u8fd0\u7b97<\/h3>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;Eigen\/Dense&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    Eigen<span class=\"token double-colon punctuation\">::<\/span>Matrix2d A<span class=\"token punctuation\">,<\/span> B<span class=\"token punctuation\">;<\/span><br \/>\n    A <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><br \/>\n         <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    B <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">,<\/span><br \/>\n         <span class=\"token number\">7<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;A &#043; B &#061;\\\\n&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> A <span class=\"token operator\">&#043;<\/span> B <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\\\\n\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u5bf9\u5e94\u76f8\u52a0<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;2 * A &#061;\\\\n&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">*<\/span> A <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\\\\n\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u6570\u4e58<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;A * B &#061;\\\\n&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> A <span class=\"token operator\">*<\/span> B <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\\\\n\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u77e9\u9635\u4e58\u6cd5<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;A^T &#061;\\\\n&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> A<span class=\"token punctuation\">.<\/span><span class=\"token function\">transpose<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\\\\n\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f6c\u7f6e<\/span><\/p>\n<p>    Eigen<span class=\"token double-colon punctuation\">::<\/span>Vector3d <span class=\"token function\">u<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">v<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\u70b9\u79ef &#061; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> u<span class=\"token punctuation\">.<\/span><span class=\"token function\">dot<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span>         <span class=\"token comment\">\/\/ 32<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5b58\u6210 ch17.cpp&#xff0c;\u6309\u9644\u5f55 C.3 \u7f16\u8bd1\u8fd0\u884c&#xff0c;\u5b9e\u9645\u8f93\u51fa&#xff1a;<\/p>\n<p>A &#043; B &#061;<br \/>\n 6  8<br \/>\n10 12<\/p>\n<p>2 * A &#061;<br \/>\n2 4<br \/>\n6 8<\/p>\n<p>A * B &#061;<br \/>\n19 22<br \/>\n43 50<\/p>\n<p>A^T &#061;<br \/>\n1 3<br \/>\n2 4<\/p>\n<p>\u70b9\u79ef &#061; 32<\/p>\n<p>A * B \u5f97\u5230 19 22 \/ 43 50&#xff0c;\u6b63\u597d\u7b49\u4e8e\u4f60\u4e0a\u9762\u624b\u7b97\u7684\u7ed3\u679c\u2014\u2014\u77e9\u9635\u4e58\u6cd5\u7684\u7b97\u6cd5\u548c\u4ee3\u7801\u662f\u4e00\u4e00\u5bf9\u5e94\u7684\u3002\u4f60\u53ef\u4ee5\u987a\u624b\u52a0\u4e00\u53e5 std::cout &lt;&lt; B * A &lt;&lt; &#034;\\\\n&#034;;&#xff0c;\u770b\u5230 B * A \u662f 23 34 \/ 31 46&#xff0c;\u548c A * B \u4e0d\u540c&#xff0c;\u4ea4\u6362\u5f8b\u4e0d\u6210\u7acb\u8fd9\u4ef6\u4e8b\u5c31\u4eb2\u773c\u786e\u8ba4\u4e86\u3002<\/p>\n<p>\u6ce8\u610f Eigen \u7684 *&#xff1a;A * B \u662f\u77e9\u9635\u4e58\u6cd5&#xff08;\u4e0d\u662f\u9010\u5143\u7d20\u4e58&#xff09;\u3002\u60f3\u9010\u5143\u7d20\u76f8\u4e58\u8981\u7528 .array()&#xff08;\u7b2c 27 \u7ae0&#xff09;\u3002\u8fd9\u662f\u65b0\u624b\u6700\u5bb9\u6613\u641e\u9519\u7684\u5730\u65b9\u3002<\/p>\n<h3>17.7 \u5c0f\u7ed3<\/h3>\n<ul>\n<li>\u52a0\u51cf&#xff1a;\u5bf9\u5e94\u5143\u7d20\u76f8\u52a0\u51cf&#xff08;\u5c3a\u5bf8\u8981\u76f8\u540c&#xff09;\u3002<\/li>\n<li>\u6570\u4e58&#xff1a;\u6bcf\u4e2a\u5143\u7d20\u4e58\u6807\u91cf\u3002<\/li>\n<li>\u8f6c\u7f6e&#xff1a;\u884c\u5217\u4e92\u6362\u3002<\/li>\n<li>\u70b9\u79ef&#xff1a;\u5bf9\u5e94\u5206\u91cf\u76f8\u4e58\u6c42\u548c\u3002<\/li>\n<li>\u77e9\u9635\u4e58\u6cd5&#xff1a;\u5de6\u77e9\u9635\u5217\u6570 &#061; 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