{"id":332,"date":"2008-12-09T19:07:07","date_gmt":"2008-12-09T19:07:07","guid":{"rendered":"https:\/\/blogs.mathworks.com\/videos\/2008\/12\/09\/video-tutorial-3d-indexing\/"},"modified":"2016-04-04T12:48:28","modified_gmt":"2016-04-04T17:48:28","slug":"video-tutorial-3d-indexing","status":"publish","type":"post","link":"https:\/\/blogs.mathworks.com\/videos\/2008\/12\/09\/video-tutorial-3d-indexing\/","title":{"rendered":"Video tutorial: 3d indexing"},"content":{"rendered":"The MATLAB user has this:\r\n<pre><code>\r\nclear\r\nclc\r\nM(:,:,1) = [1,2;3,4];\r\nM(:,:,2) = [21,22;23,24];\r\nJ = [1,2; 2,1];\r\n<\/code><\/pre>\r\nThey want this:\r\n<pre><code>ans =\r\n[1 22\r\n23 4]<\/code>\r\n<\/pre>\r\nThey tried this:\r\n<pre><code>D = M(:,:,J) % This doesn't work,<\/code><\/pre>\r\nThis video discusses this solution:\r\n<pre><code>[nR, nC] = size(J);\r\nD = zeros(nR,nC);\r\nfor r = 1:nR\r\n     for c = 1:nC\r\n          D(r,c) = M(r,c,J(r,c));\r\n    end\r\nend     <\/code><\/pre>\r\n<div><div class=\"row\"><div class=\"col-xs-12 containing-block\"><div class=\"bc-outer-container add_margin_20\"><videoplayer><div class=\"video-js-container\"><video data-video-id=\"3877438007001\" data-video-category=\"blog\" data-autostart=\"false\" data-account=\"62009828001\" data-omniture-account=\"mathwgbl\" data-player=\"rJ9XCz2Sx\" data-embed=\"default\" id=\"mathworks-brightcove-player\" class=\"video-js\" controls><\/video><script src=\"\/\/players.brightcove.net\/62009828001\/rJ9XCz2Sx_default\/index.min.js\"><\/script><script>if (typeof(playerLoaded) === 'undefined') {var playerLoaded = false;}(function isVideojsDefined() {if (typeof(videojs) !== 'undefined') {videojs(\"mathworks-brightcove-player\").on('loadedmetadata', function() {playerLoaded = true;});} else {setTimeout(isVideojsDefined, 10);}})();<\/script><\/div><\/videoplayer><\/div><\/div><\/div><\/div>\r\n&nbsp;","protected":false},"excerpt":{"rendered":"<div class=\"thumbnail thumbnail_asset asset_overlay video\"><a href=\"https:\/\/blogs.mathworks.com\/videos\/2008\/12\/09\/video-tutorial-3d-indexing\/?dir=autoplay\"><img decoding=\"async\" src=\"https:\/\/cf-images.us-east-1.prod.boltdns.net\/v1\/static\/62009828001\/f18c5490-0c32-47f8-a37f-0cefd61f3596\/719197ad-95a6-49b5-b103-854f3ca20117\/160x90\/match\/image.jpg\" onError=\"this.style.display ='none';\"\/>\n      <div class=\"overlay_container\">\n      <span class=\"icon-video icon_color_null\"><time class=\"video_length\">2:50<\/time><\/span>\n      <\/div>\n      <\/a><\/div><p>The MATLAB user has this:\r\n\r\nclear\r\nclc\r\nM(:,:,1) = [1,2;3,4];\r\nM(:,:,2) = [21,22;23,24];\r\nJ = [1,2; 2,1];\r\n\r\nThey want this:\r\nans =\r\n[1 22\r\n23 4]\r\n\r\nThey tried this:\r\nD = M(:,:,J) % This doesn&#8217;t&#8230; <a class=\"read-more\" href=\"https:\/\/blogs.mathworks.com\/videos\/2008\/12\/09\/video-tutorial-3d-indexing\/\">read more >><\/a><\/p>","protected":false},"author":68,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[4,17],"tags":[],"_links":{"self":[{"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/posts\/332"}],"collection":[{"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/users\/68"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/comments?post=332"}],"version-history":[{"count":1,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/posts\/332\/revisions"}],"predecessor-version":[{"id":2103,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/posts\/332\/revisions\/2103"}],"wp:attachment":[{"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/media?parent=332"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/categories?post=332"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/tags?post=332"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}