{"id":336,"date":"2013-06-13T08:04:51","date_gmt":"2013-06-13T08:04:51","guid":{"rendered":"http:\/\/ahay.org\/blog\/?p=336"},"modified":"2015-08-31T13:09:58","modified_gmt":"2015-08-31T13:09:58","slug":"extending-matlab-interface","status":"publish","type":"post","link":"https:\/\/ahay.org\/blog\/2013\/06\/13\/extending-matlab-interface\/","title":{"rendered":"Extending MATLAB interface"},"content":{"rendered":"<p>For those using <a href=\"\/wiki\/Guide_to_madagascar_API#MATLAB_interface\">MATLAB interface to Madagascar<\/a>, a new function, <strong>m8r<\/strong>, allows running Madagascar programs and workflows directly on MATLAB objects. The following MATLAB code runs <a href=\"\/RSF\/book\/jsg\/timefreq\/paper_html\/\">regularized time-frequency analysis<\/a> using <a href=\"\/RSF\/sftimefreq.html\">sftimefreq<\/a>:<\/p>\n<div class=\"code-box\"><div class=\"code-title\"><i class=\"fa fa-code\"><\/i> <div class=\"pull-right\"><a href=\"#\" class=\"btn btn-default btn-xs toggle-code\" data-toggle=\"tooltip\" title=\"Toggle code\"><i class=\"fa fa-toggle-up\"><\/i><\/a><\/div><\/div><pre ><code class=\"matlab\">% create chirp signal\nt=0:0.001:1;\ny=chirp(t,100,1,25,'q',[],'convex');\n\n% spectragram analysis in MATLAB\nspectrogram(y,256,200,256,1000);\nset(gca,'xlim',[0,250]);\nset(gca,'ydir','reverse');\nylabel('Time (s)');\n<\/code><\/pre><\/div>\n<p><img decoding=\"async\" src=\"\/blog\/wp-content\/uploads\/2015\/08\/matlab.png\" alt=\"\" title=\"\" \/><\/p>\n<div class=\"code-box\"><div class=\"code-title\"><i class=\"fa fa-code\"><\/i> <div class=\"pull-right\"><a href=\"#\" class=\"btn btn-default btn-xs toggle-code\" data-toggle=\"tooltip\" title=\"Toggle code\"><i class=\"fa fa-toggle-up\"><\/i><\/a><\/div><\/div><pre ><code class=\"matlab\">% time-frequency analysis in Madagascar\ntf = m8r('sftimefreq rect=50 nw=251 dw=1',y',0.001);\n\nf = 0:250;\nimagesc(t,f,tf);\nxlabel('Frequency (Hz)');\nylabel('Time (s)');\n<\/code><\/pre><\/div>\n<p><img decoding=\"async\" src=\"\/blog\/wp-content\/uploads\/2015\/08\/matlab-m8r.png\" alt=\"\" title=\"\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>For those using MATLAB interface to Madagascar, a new function, m8r, allows running Madagascar programs and workflows directly on MATLAB objects. The following MATLAB code runs regularized time-frequency analysis using sftimefreq: % create chirp signal t=0:0.001:1; y=chirp(t,100,1,25,&#8217;q&#8217;,[],&#8217;convex&#8217;); % spectragram analysis in MATLAB spectrogram(y,256,200,256,1000); set(gca,&#8217;xlim&#8217;,[0,250]); set(gca,&#8217;ydir&#8217;,&#8217;reverse&#8217;); ylabel(&#8216;Time (s)&#8217;); % time-frequency analysis in Madagascar tf = m8r(&#8216;sftimefreq [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","activitypub_content_warning":"","activitypub_content_visibility":"local","activitypub_max_image_attachments":4,"activitypub_interaction_policy_quote":"","footnotes":""},"categories":[6],"tags":[],"class_list":["post-336","post","type-post","status-publish","format-standard","hentry","category-systems"],"_links":{"self":[{"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/posts\/336","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/comments?post=336"}],"version-history":[{"count":3,"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/posts\/336\/revisions"}],"predecessor-version":[{"id":16195,"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/posts\/336\/revisions\/16195"}],"wp:attachment":[{"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/media?parent=336"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/categories?post=336"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/tags?post=336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}