Re: How to modify structure fields inside functions

[c.]

On 6 Apr 2012, at 11:23, Bruno Picasso wrote:

Hi everybody,

I need your help to understand how to modify a structure field inside a function. For example:

a.b=3

a =

{

 b =  3

}

function modify (s)

setfield(s,'b',5)

endfunction

modify(a)

ans =

{

 b =  5

}

a.b

ans =  3

Thanks for your kind help

Bruno

that cannot be done,
all functions in the octave/matlab 
language have pass-by-value semantics, 
so you have to do it like this:

a.b = 3;

function res = modify (s)
setfield (s,'b',5); %% or, equivalently, s.b = 5;
endfunction

a = modify (a);
a.b
ans =  5

c.

P.S. an alternative would be to use global variables