Matrix help
in [Matlab]
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From: neo sam on 5 Jul 2010 19:48 Hello all, I am working on Matlab and need some help. How can I search for a single element from a nx2 matrix? for example: if A = 12 0 15 1 17 0 19 0 20 1 then how can I find out whether the value of '20' is '1' or '0' ? I'm just using this as a flag and cant seem to figure it out. Is there any other way of doing this? Thank you.
From: dpb on 5 Jul 2010 20:14 neo sam wrote: > Hello all, > I am working on Matlab and need some help. How can I search for a single > element from a nx2 matrix? for example: > > if A = 12 0 > 15 1 > 17 0 > 19 0 > 20 1 > then how can I find out whether the value of '20' is '1' or '0' ? > I'm just using this as a flag and cant seem to figure it out. Is there > any other way of doing this? doc find read section on logical indexing Depending on what you're next wanting to do, options vary... A few options, there are many perturbations and others will undoubtedly add many...hopefully this will get you started anyway... >> if A(A(:,1)==20,2)==1, disp('found'), end found >> idx=find(A(:,1)==20) idx = 5 >> A(idx,2)==1 ans = 1 >>
From: neo sam on 6 Jul 2010 18:36
dpb <none(a)non.net> wrote in message <i0tslb$798$1(a)news.eternal-september.org>... > neo sam wrote: > > Hello all, > > I am working on Matlab and need some help. How can I search for a single > > element from a nx2 matrix? for example: > > > > if A = 12 0 > > 15 1 > > 17 0 > > 19 0 > > 20 1 > > then how can I find out whether the value of '20' is '1' or '0' ? > > I'm just using this as a flag and cant seem to figure it out. Is there > > any other way of doing this? > > doc find > > read section on logical indexing > > Depending on what you're next wanting to do, options vary... > > A few options, there are many perturbations and others will undoubtedly > add many...hopefully this will get you started anyway... > > >> if A(A(:,1)==20,2)==1, disp('found'), end > found > >> idx=find(A(:,1)==20) > idx = > 5 > >> A(idx,2)==1 > ans = > 1 > >> This does the trick! thank you so much! |