how to save the matrix after each iteration ?

I have a for loop from 1 to 768 in each iteration I will discard one old sample and add new one (the procedùre is like a convolùtion). the oùtpùt for each iteration is a matrix of dimention [384 1] I want to plot this matrix when adding new sample.

[Geoff Hayes]

riki - is the output of each iteration always of the same (384x1) dimension? If so, then you could create a matrix that will hold each of the 768 matrices (could be simply 384x768 where each column is the output from each iteration). If the output of each iteration is of a different dimension, then consider using a cell array to store the data.

[riki ragùa]

yes, the output matrix will always be of same dimention how can I hold the matrices ?

Answer 1

[Pawel Jastrzebski]

output     = 384;
iterations = 768;

% preallocate the matrix

mResults = zeros(output, iterations);

for i = 1:iterations

      % your code, i.e.:

      mResults(:,i) = rand(output,1); 

end

[riki ragùa]

thank you

Answer 2

[Geoff Hayes]

riki - since your output array on each iteration is of the same dimension, then your matrix could be

 myData = zeros(384,768);

and when iterating, you could do something like

 for k=1:768
    % do a calculation to get the output
    output = ...;
    % save this to your myData matrix
    myData(:,k) = output; % since output is 384x1 matrix
 end

[riki ragùa]

thank you for your help it works . I have another question as we said the output of each iteration is a 384*1 matrix name it T. if I want to save only the first matrix (when i=1) then I will save for i>1 the last point of matrix T which is T(384,1) because I want to plot all this at the end . T(i=1) and the others points .

[Geoff Hayes]

Well if you do as above and save all of the data, then the last point from each iteration will be the 384th row of myData. So this would be

 myData(end,:)

where we use end to get the last row and : to get all columns of that row.

[Aashish Jagadeesh Shastry]

If the output has dimensions like (2,13) and the number of iterations is 2, how can I save the matrix for each iteration?

[Geoff Hayes]

Aashish - you could assign something like

myData = zeros(2,13);
for k=1:2
    % do a calculation to get the output
    output = ...;
    % save this to your myData matrix
    myData(k,:) = output; % since output is 2x13 matrix
end