Re: Function of vector with meshgrid and surf

[karl]

Am 12.11.2015 um 08:02 schrieb Sebastian Schöps:
> karl wrote
> > function fr = frame1 (x)
> > fr=x(1)+x(2);
> > endfunction
> >
> > Is it possible in this case, i.e. with no modification of frame1, to avoid
> > looping?
> No. You will always need two iterations to evaluate all combinations of x
> and y. However, these loops can be vecorized if your function allows it. In
> your case it seems that only one of the two loops can be vectorized.
>
> Please consider that the input of your function is a 11-by-22-MATRIX if you
> try to vectorize both loops. Thus the following does not make sense (it
> assumes that x is a 2-by-1 vector):
>
> function fr = frame1 (x)
> fr=x(1)+x(2);
> endfunction
>
> if you do not believe me, ask Octave:
>
> function fr = frame1 (x)
> size(x)
> fr=x(1)+x(2);
> endfunction
>
>
>
> --
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> http://octave.1599824.n4.nabble.com/Function-of-vector-with-meshgrid-and-surf-tp4673436p4673448.html
> Sent from the Octave - General mailing list archive at Nabble.com.
>
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I have found now the solution. With "vec" one can transform the matrices X and Y into vectors, one can calcuulate the 
function
values with one command and then getting  the matrix  form of the function values with 
"reshape".