How to Preallocate this loop?

%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?

Answer 1

[KALYAN ACHARJYA]

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.