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meshgrid values to function without loop

Christopher Brokmann さんによって質問されました 2019 年 1 月 30 日
最新アクティビティ Rik
さんによって 回答されました 2019 年 1 月 30 日
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,...);

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Nimananda Sharma 2019 年 1 月 30 日
It appears that your function accepts only scalar input
One possible solution would to change your function to use maxtrix?
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
2019 年 1 月 30 日
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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1 件の回答

回答者: Rik
2019 年 1 月 30 日

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];
Z = arrayfun(@f_SomeFunction,Coordinate,someConstant_array);

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