hi every body.
my codes give me errors. plz help me to fix it.
clear;syms x;sy=[0 -1i;1i 0];s=kron(sy,sy);t=1;de=50;range1=0:0.1:10;innerstate=[1 1 0 0;1 1 1 1;1 1 1 0;1 0 1 0];ro=zeros(size(innerstate,1));rov=zeros(size(innerstate,1));Ha='[x/2 0 0 0;0 -x/2 x 0;0 x -x/2 0;0 0 0 x/2]';Haf = str2func(sprintf('@(%s)%s;','x',Ha));[vectors,values]=eig(Haf(x));for n=1:size(innerstate,1) for m=1:size(innerstate,1) ro=ro+(vectors(:,m)*(vectors(:,n)')); endendsymsum(symsum((vectors(:,m)*(vectors(:,n)')),m,1,4),n,1,4)Error using sym/symsum (line 52)Unable to compute sum with respect to '4'. Summation index must bea symbolic variable.Error in remove_shadow (line 22)symsum(symsum((vectors(:,m)*(vectors(:,n)')),m,1,4),n,1,4)
Best Answer