Find the closest value in a matrix matlab -


how can find closest element in matrix in matlab?

suppose have matrix of size 300x200 , want find value , index of element in matrix closest element given.

does know how can done in matlab? know how given array can not figure out how done matrix.

a smaller case might understand -

code

%%// given big matrix, taken matrix of random numbers demo a1 = rand(10,5); %%// replace 300x200 matrix  %// demo, let assume, looking element happens closest element in 4th row , 5th column, verified @ end  element = a1(4,5)+0.00001; %%// element in search  %%// find linear index of location [~,ind] = min(reshape(abs(bsxfun(@minus,a1,element)),numel(a1),[]));  %%// convert linear index row , column numbers [x,y] = ind2sub(size(a1),ind)

output

x =      4  y =        5

as can seen, output matches expected answer.

extended part: if have set of search numbers, can process them closeness efficiently using bsxfun. shown below -

code

%%// given big matrix, taken matrix of random numbers demo a1 = rand(10,5); %%// replace 300x200 matrix  %// array of search numbers search_array = [a1(4,5)+0.00001;a1(6,5)+0.00001;a1(4,4)+0.00001;a1(4,2)+0.00001];  %%// find linear index of location [~,ind] = min(abs(bsxfun(@minus,a1(:),search_array')));%//'  %%// convert linear index row , column numbers [x,y] = ind2sub(size(a1),ind)

output

x =      4     6     4     4   y =      5     5     4     2

Comments

Post a Comment

Popular posts from this blog

android - Get AccessToken using signpost OAuth without opening a browser (Two legged Oauth) -

i using signpost oauth access data magento server. have read various tutorials on same , reach point open browser user can enter credentials. however, per requirement have automate part. hence, user should not browser page. have set-up done on server side ( magento ), hit url , returned call page. same through program in android. i have tried below, consumer = new commonshttpoauthconsumer(key, secret); provider = new commonshttpoauthprovider(oauth_init_url,access_token_url, authorize_url); try { provider.retrieverequesttoken(consumer, oauth.out_of_band); log.d("tokens" , consumer.gettoken() + " -- " + consumer.gettokensecret()); } and request tokens. dont know how bypass next step. tried directly accessing accesstoken (stupid of me) provider.retrieveaccesstoken(consumer, "mycallback://callback"); no luck, ends in oauth.signpost.exception.oauthnotauthorizedexception: authorization failed (server replied 401). ...
Read more

org.mockito.exceptions.misusing.InvalidUseOfMatchersException: mockito -

getting error org.mockito.exceptions.misusing.invaliduseofmatchersexception: invalid use of argument matchers! 1 matchers expected, 2 recorded. exception may occur if matchers combined raw values: //incorrect: somemethod(anyobject(), "raw string"); when using matchers, arguments have provided matchers. example: //correct: somemethod(anyobject(), eq("string matcher")); at when( getprogramservice .callservice(any(getprogramtype.class))) .thenreturn(jaxbresponse); please explain error , possible resolution the code posted looks fine; don't see problem it. code before or above causing exception. key here: invalid use of argument matchers! 1 matchers expected, 2 recorded. any , used above, doesn't return "special kind of null" or "special kind of getprogramtype"; don't exist. instead, returns null , side effect puts matcher on stack. whe...
Read more

google shop client API returns 400 bad request error while adding an item -

i'm working on solution add items in google shopping market java application. following tutorial real mess because of missing classes of laste release, after setting 1.5-beta maven managed make base example typecheck correctly classes. still can make simple task of adding 1 item. instead of posting whole code i'm posting part creates product feed. private product createproduct(string id) { product product = new product(); product.title = "red wool sweater"; product.content = new content( "text", "comfortable , soft, sweater keep warm on " + "cold winter nights. red , blue stripes."); product.appcontrol = new appcontrol(); product.appcontrol.addrequireddestination("productads"); product.externalid = id; product.lang = "it"; product.country = "it"; product.condition = "nuovo"; product.price = new price("eu...
Read more