First off, "load" is for Matlab files, not raw text. Check out textscan. If your code isn't error-ing, you probably have old versions of the variables sitting around somehow
Next, there are several code issues to clean up:
This loop can be done with elementwise vector operations. Change it from
for i=1:size(Rzero1,1)
w(i) = 2*pi*freq1(i);
Zcmag(i) = abs(((Rzero1(i)+1j*w(i)*Lzero1(i))./(Gzero+1j*w(i)*Czero))); %magnitude of Zc
Zc(i) = sqrt(((Rzero1(i)+1j*w(i)*Lzero1(i))./(Gzero+1j*w(i)*Czero)));
end
to
w = 2*pi*freq1;
Zc(i) = sqrt((Rzero1+1j*w.*Lzero1)./(Gzero+1j*w*Czero));
Zcmag = abs(Zc.^2);
Also, these lines are completely unnecessary:
w(1)=0;
Zc(1)=0;
Zcpos(1)=0;
Zcmag(1)=0;
Zcposmag(1)=0;
i=1;
k=1;
