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The function I want to vectorize is Cross-in-Tray Function (2-D):

f(X,Y) = -0.0001*(abs(sin(X)*sin(Y)*exp(abs(100-sqrt(X^2+Y^2)/pi)))+1)^0.1;

I want to use the command (to plot the function):

fsurf(@(x,y) crossintrayfcn([x,y]))

I have this two function codes:

function z = crossintrayfcn(xx)

x = xx(:,1);

y = xx(:,2);

expcomponent = abs(100-(sqrt(x.^2 + y.^2)/pi));

z = -0.0001*((abs(sin(x).*sin(y).*exp(expcomponent))+1).^0.1);

end

And:

function [y] = crossintrayfcn(xx)

x1 = xx(1);

x2 = xx(2);

fact1 = sin(x1)*sin(x2);

fact2 = exp(abs(100 - sqrt(x1^2 + x2^2)/pi));

y = -0.0001 * (abs(fact1*fact2) + 1)^0.1;

end

But they plot nothing!

Thanks!

Star Strider
on 1 Mar 2018

Vectorising it simply requires using element-wise operations:

f = @(X,Y) -0.0001*(abs(sin(X).*sin(Y).*exp(abs(100-sqrt(X.^2+Y.^2)/pi)))+1).^0.1;

[x,y] = meshgrid(linspace(-10, 10, 49));

figure

surfc(x, y, f(x,y))

grid on

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