how to save the matrix after each iteration ?

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riki ragùa 2018-3-14

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评论： Geoff Hayes 2020-4-14

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.

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Geoff Hayes 2018-3-14

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 2018-3-15

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

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Answer 1

Pawel Jastrzebski 2018-3-15

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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

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riki ragùa 2018-3-15

thank you

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Answer 2

Geoff Hayes 2018-3-15

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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

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Aashish Jagadeesh Shastry 2020-4-14

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 2020-4-14

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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