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## Re: Function of vector with meshgrid and surf

 From: Sebastian Schöps Subject: Re: Function of vector with meshgrid and surf Date: Wed, 11 Nov 2015 15:26:39 -0800 (PST)

```karl wrote
> I have a small problem with the syntax.
> ...
> How do I have to modify the line "Z=frame([X,Y])" that the surf command
> works and gives the surface?

X and Y are matrices (in your case 11x11) and [X,Y] is even 11x(2*11). Your
functions expects vectors and thus it does not work properly. You either
have to modify "frame" to allow matrix input or you have to loop over the
entries. Here are three possibilities:

function karl
x1=0:0.1:1;
[X,Y]=meshgrid(x1,x1);

Z=frame_modified(X,Y);
figure;
surf(X,Y,Z);

for i=1:size(Z,1)
Z(i,:)=frame([X(i,:); Y(i,:)]);
end
figure;
surf(X,Y,Z);

for i=1:size(Z,1)
for j=1:size(Z,1)
Z(i,j)=frame([X(i,j); Y(i,j)]);
end
end
figure;
surf(X,Y,Z);

end

function fr = frame_modified (x,y)
fr=x+y;
endfunction

function fr = frame (x)
fr=x(1,:)+x(2,:);
endfunction

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```