Matlab: Multiple assignment through logical indexing

Question

I am wondering if there is some way, how to multiple assign values to different variables according logical vector.

For example:

I have variables a, b, c and logical vector l=[1 0 1] and vector with values v but just for a and c. Vector v is changing its dimension, but everytime, it has the same size as the number of true in l.

I would like to assign just new values for a and c but b must stay unchanged.

Any ideas? Maybe there is very trivial way but I didn't figure it out.

Thanks a lot.

@JacubJon just for curiosity, if I understood your question right. Could you please check if my solution would also work? Because if it's an invalid solution I'd rather delete it. — Robert Seifert
– Robert Seifert, Commented Dec 17, 2013 at 9:37
@thewaywewalk, I didn't try your solution but I think we don't understand each other. In case I change logical vector 'l' to '[0 1 0]' means that I would like to assign new value just for variable 'b' and that means vector 'v' changed its dimension to 1 because it contains just new value for 'b'.. Is it clear now. Thanks — Jakub Jon
– Jakub Jon, Commented Dec 23, 2013 at 10:22

Daniel · Accepted Answer · 2013-12-16 00:27:30Z

1

I think your problem is, that you stored structured data in an unstructured way. You assume a b c to have a natural order, which is pretty obvious but not represented in your code.

Replacing a b c with a vector x makes it a really easy task.

x(l)=v(l);

Assuming you want to keep your variable names, the simplest possibility I know would be to write a function:

function varargout=update(l,v,varargin)
varargout=varargin;
l=logical(l);
varargout{l}=v(l);
end

Usage would be:

[a,b,c]=update(l,v,a,b,c)

edited Dec 16, 2013 at 0:27

answered Dec 16, 2013 at 0:06

Daniel

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1 Comment

Jakub Jon Over a year ago

Thanks, for sure, I can do that like this, but my variables a, b, c comes from different sources (structures) and I would like to keep continuity and make it in easiest way.

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