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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?

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dpb
dpb il 21 Gen 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 Commenti
ricsf
ricsf il 22 Gen 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 il 22 Gen 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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John Petersen
John Petersen il 21 Gen 2015
a = 0.5 - rand(3,3);
%Positive numbers
a(a>=0)
% negative numbers
a(a>0)

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