How to Preallocate this loop?

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suriyaprasanth s
suriyaprasanth s 2021-3-4
编辑： KALYAN ACHARJYA 2021-3-4
%clear all
tic
ncut=60;
alpha=3;
for nloop=1:ncut
zx=(-3+(nloop/10));
xaxis(nloop)=zx;
for ploop=1:ncut
zy=(-3+(ploop/10));
yaxis(ploop)=zy;
z=zx+(1j*zy);
term1=(1/pi*(1+exp(-2*abs(z-alpha)^2)));
term2=(exp(-2*abs(z-alpha)^2));
term3=(exp(-2*abs(z+alpha)^2));
term4=(exp(-2*((abs(z)^2)+z*conj(alpha)-alpha*conj(z))));
term5=(exp(-2*((abs(z)^2)-z*conj(alpha)+alpha*conj(z))));
term6=(term2+term3+term4+term5)*term1;
wig(nloop,ploop)=real(term6);
end
end
surf(xaxis,yaxis,wig)
timelapsed = toc
how to preallocate the for loop?

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KALYAN ACHARJYA
KALYAN ACHARJYA 2021-3-4
编辑：KALYAN ACHARJYA 2021-3-4
xaxis=zeros(1,ncut);
yaxis=zeros(1,ncut);
wig=zeros(ncut,ncut);
More: Avoid using xaxis and yaxis as variable names, there may be possibility of conflicts with Matlab inbuilt function.

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