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Function for Script. I need to write a Function that selects the positive and negative numbers from a matrix. How to write this?

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I need to write a Function that selects the positive and negative numbers from a matrix. How to write this?

Accepted Answer

dpb
dpb on 21 Jan 2015
function [p,n]=splitsigns(x)
% return positive/negative values from array x in vectors p/n, respectively
p=x(x>0);
n=x(x<0);
This one excludes 0; pick where you want those if do...
  7 Comments
ricsf
ricsf on 22 Jan 2015
Ok! So, like you have writen in the first one, just to have no doubts in this.
I've the declaration of the function, with the: Output Arg (n,p) and the Input Arg (x)
And the Variables of the funtion are: p=x(x>0); n=x(x<0);
Am I thinking correctly?
dpb
dpb on 22 Jan 2015
Read the help files on functions, but in general yes. Other than I'd say that p=x(x>0); and n=x(x<0); are expressions, not variables. There are no strictly local variables in those functions, only the input/output arguments (which are, of course variables just not local).

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More Answers (1)

John Petersen
John Petersen on 21 Jan 2015
a = 0.5 - rand(3,3);
%Positive numbers
a(a>=0)
% negative numbers
a(a>0)

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