Splitting up FOR loop for vectorizing so it runs quicker coding issue

[RT]

I'm trying to vectorize and split up a for loop to make it run faster but the variable "aa_sig_combined_vect" begins to return nothing but zeros after cell 5569 any idea how to fix this? see code below:

t=rand(1,556790);

inner_freq=rand(8193,6);

N=100; % use N chunks

nn = int32( linspace(1, length(t)+1, N+1) );

aa_sig_combined_vect=zeros(size(t));

total_time_so_far=0;

D = diag(inner_freq(1:end-1,2));

A = inner_freq(1:end-1,1);

for ii=1:N

ind = nn(ii):nn(ii+1)-1;

tic;

cosPara = 2 * pi * A * t(ind);

toc;

cosResult = cos( cosPara );

sumParaA = D * cosResult;

toc;

sumParaB = repmat(inner_freq(1:end-1,3),[1 length(ind)]);

toc;

aa_sig_combined_vect(ind) = sum( sumParaA + sumParaB );

toc;

total_time_so_far=total_time_so_far+sum(toc)

return;

end

fprintf('- Complete test in %4.4fsec or %4.4fmins\n',total_time_so_far,total_time_so_far/60);

The original working loop I'm trying to improve the speed of.

clear all,

t=rand(1,556790);

inner_freq=rand(8193,6);

N=100; # use N chunks

nn = int32(linspace(1, length(t)+1, N+1))

aa_sig_combined=zeros(size(t));

total_time_so_far=0;

for ii=1:N

tic;

ind = nn(ii):nn(ii+1)-1;

aa_sig_combined(ind) = sum(diag(inner_freq(1:end-1,2)) * cos(2 .* pi .* inner_freq(1:end-1,1) * t(ind)) .+ repmat(inner_freq(1:end-1,3),[1 length(ind)]));

toc

total_time_so_far=total_time_so_far+sum(toc)

end

fprintf('- Complete test in %4.4fsec or %4.4fmins\n',total_time_so_far,total_time_so_far/60);

RMSERepmat = sqrt(mean((aa_sig_combined-aa_sig_combined_vect).^2)) %root men square error between two arrays lower is better