![\"MATLAB](\"https:\/\/blogs.mathworks.com\/images\/seth\/2010Q1\/newsReaderAlerts.png\")
<\/p>\r\n\r\nI was just clicking through my vast inbox of unread e-mail, and saw a MATLAB Central news reader alert.<\/p>\r\n\r\n
<\/p>\r\n\r\n
I quickly scanned the message and then clicked on the link to view the thread on MATLAB Central<\/a>.<\/p>\r\n\r\n Regular contributor Ben Harper<\/a> asked the question:\r\n\r\n His first response came from Jason Retik<\/a>:\r\n\r\n This has all the ingredients to get Ben up and running, but Gavin Walker<\/a> also replied: While I thought a function like this existed, it wasn't at the top of my mind. bdIsLoaded<\/a><\/tt> returns true for models that are in memory<\/em>. The function takes a model name as a string, or a cell array of model names as its input.<\/p>\r\n\r\n If you edit bdIsLoaded.m<\/tt>, you will see that it includes the exact find_system<\/tt> call Jason suggested, plus a little code to check if your specific model is loaded.<\/p>\r\n\r\n Is that the answer?<\/p>\r\n\r\n Going back to the original question, I want to further improve this answer. The original question was about the use of open_system<\/tt>, which is different than load_system<\/tt>. Block diagrams can be loaded, but not visible to the user. I think Ben's original question is whether a particular model is visible or not, so here is my answer:<\/p>\r\n\r\n First check to see if the model is loaded, and if it is, use get_param to check the Shown property. Here is an example:\r\n\r\n Where do you get your answers?<\/strong><\/p>\r\nHow about technical support<\/a>? Leave a comment here<\/a> and tell us about it.<\/p>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n","protected":false},"excerpt":{"rendered":" I was just clicking through my vast inbox of unread e-mail, and saw a MATLAB Central news reader alert.\r\n\r\n\r\n\r\nI quickly scanned the message and then clicked on the link to view the thread on MATLAB... read more >><\/a><\/p>","protected":false},"author":40,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[15,34],"tags":[],"_links":{"self":[{"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/posts\/82"}],"collection":[{"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/users\/40"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/comments?post=82"}],"version-history":[{"count":3,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/posts\/82\/revisions"}],"predecessor-version":[{"id":6998,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/posts\/82\/revisions\/6998"}],"wp:attachment":[{"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/media?parent=82"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/categories?post=82"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/simulink\/wp-json\/wp\/v2\/tags?post=82"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"Simulink](\"https:\/\/blogs.mathworks.com\/images\/seth\/2010Q1\/simulink_open_systemThread.png\")
<\/p>\r\n\r\ni can open a simulink file with \"open_system\" command.\r\n\r\nI want to see if the simulink model is opened?
\r\nhow can i check whether the mdl file is opened or not?
\r\n
\r\nthank you. <\/blockquote>
\r\n<\/p>\r\n\r\nopenModels = find_system('SearchDepth', 0)
\r\n
\r\nopenModels will be a cell array of all the currently opened models. You can \r\nuse the STRCMP function on openModels to check whether a particular model is \r\nopen.<\/blockquote>
\r\n<\/p>\r\n\r\n
\r\n
\r\nTry \"bdIsLoaded\"
\r\n
\r\nGavin<\/blockquote>
\r\n<\/p>\r\n\r\n>> load_system('vdp')
\r\n>> bdIsLoaded('vdp')
\r\nans =
\r\n 1
\r\n>> get_param('vdp','Shown')
\r\nans =
\r\noff
\r\n>> open_system('vdp')
\r\n>> get_param('vdp','Shown')
\r\nans =
\r\non<\/code>
\r\n
\r\nThe model is only visible if Shown==on.<\/p>\r\n\r\n