{"id":331,"date":"2008-12-01T21:43:16","date_gmt":"2008-12-01T21:43:16","guid":{"rendered":"https:\/\/blogs.mathworks.com\/videos\/2008\/12\/01\/video-tutorial-tolerances-in-comparisons\/"},"modified":"2016-04-04T12:55:23","modified_gmt":"2016-04-04T17:55:23","slug":"video-tutorial-tolerances-in-comparisons","status":"publish","type":"post","link":"https:\/\/blogs.mathworks.com\/videos\/2008\/12\/01\/video-tutorial-tolerances-in-comparisons\/","title":{"rendered":"Video tutorial: Tolerances in comparisons"},"content":{"rendered":"Sometimes you will do a calculation where the answer looks like &#8216;0&#8217; or &#8216;1&#8217; or some other number like that. The natural thing to do is to do a test like this:\r\n<pre><code>\r\nif (answer == 1)\r\n     Do something\r\nend\r\n<\/code><\/pre>\r\nHowever, if the calculation was done in double precision, answer might actually be 1.000000001 or something like that. This video discusses a strategy for overcoming this:\r\n<pre><code>\r\nif abs(answer - 1) &lt; 1e-14\r\n     Do something\r\nend\r\n<\/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=\"3877438008001\" 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\/01\/video-tutorial-tolerances-in-comparisons\/?dir=autoplay\"><img decoding=\"async\" src=\"https:\/\/cf-images.us-east-1.prod.boltdns.net\/v1\/static\/62009828001\/f1716e8b-bc0d-466d-a2ad-fce972ba5814\/c1ee340a-8a6d-40c7-9072-33018bde2b06\/1280x720\/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\">2:23<\/time><\/span>\n      <\/div>\n      <\/a><\/div><p>Sometimes you will do a calculation where the answer looks like &#8216;0&#8217; or &#8216;1&#8217; or some other number like that. The natural thing to do is to do a test like this:\r\n\r\nif (answer ==&#8230; <a class=\"read-more\" href=\"https:\/\/blogs.mathworks.com\/videos\/2008\/12\/01\/video-tutorial-tolerances-in-comparisons\/\">read more >><\/a><\/p>","protected":false},"author":68,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[4,12],"tags":[],"_links":{"self":[{"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/posts\/331"}],"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=331"}],"version-history":[{"count":1,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/posts\/331\/revisions"}],"predecessor-version":[{"id":2115,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/posts\/331\/revisions\/2115"}],"wp:attachment":[{"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/media?parent=331"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/categories?post=331"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/tags?post=331"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}