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meshgrid values to function without loop

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Christopher Brokmann
回答： Rik 2019-1-30
Hello, i want to give x,y coordinates to a self-written function. The current state is, that i use 2 loops. I think that this is a very ugly and computation consuming solution. Can someone help me to improve this?
x = linspace(0,1,11) ;
y = linspace(0,1,11) ;
[X,Y] = meshgrid(x,y) ;
for kk = 1:11
for nn = 1:11
Coordinate = [X(kk,nn) Y(kk,nn)];
Z(kk,nn) = f_SomeFunction(Coordinate,someConstant,...);
end
end
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Christopher Brokmann
Christopher Brokmann 2019-1-30
its a very long function (~2k lines) which only accepts scalar inputs... before i take the long challenge to change the function to matrix input, i want to change the loops.
Matt J
Matt J 2019-1-30
编辑：Matt J 2019-1-30
But the loops don't have any computation in them except your call to f_SomeFunction. There's nothing else there to optimize.

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采纳的回答

Rik
Rik 2019-1-30
If you are not prepared to change the function to accept non-scalar inputs, you can use this code to implicitly use for-loops. This can be faster in some circumstances, and it may look cleaner (even if that is subjective).
Coordinate = [X Y];
someConstant_array=repmat(someConstant,size(Coordinate));
Z = arrayfun(@f_SomeFunction,Coordinate,someConstant_array);

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