arrays,matlab,loops,math,for-loop , Matlab: Writing to a file


Matlab: Writing to a file

Question:

Tag: arrays,matlab,loops,math,for-loop

I want to store mean_2....mean_8, std_2....std_8, and coVariance as separate columns in a file. Help Please?

This Code calculates IntervalFeatures of Erp signal with 256 time frames and plots them Datapoints are store in A

___________HowTheCodeWorks________________________________________________

each 1x4 sliding sub-matrix is made a column for eg:- if A is 1x6 you would get 1-2-3-4, 2-3-4-5, 3-4-5-6 each as a column ending with 3 columns. for 1x10 matrix, you would get 7 columns

calculating the mean of every column

Subtract each value of the column with the mean value of corresponding column finally element-wise squaring, mean of each column and then element-wise sqrt to get the output.

A=firstElec;

%___________Length2_____________________
reshaped_2 = im2col(A,[1 2],'sliding');
mean_2 = mean(reshaped_2);
out1 = bsxfun(@minus,reshaped_2,mean_2);
std_2 = sqrt(mean(out1.^2))

%___________Length4_____________________
reshaped_4 = im2col(A,[1 4],'sliding');
mean_4 = mean(reshaped_4);
out2 = bsxfun(@minus,reshaped_4,mean_4);
std_4 = sqrt(mean(out2.^2))

%___________Length8_____________________
reshaped_8 = im2col(A,[1 8],'sliding');
mean_8 = mean(reshaped_8);
out3 = bsxfun(@minus,reshaped_8,mean_8);
std_8 = sqrt(mean(out3.^2))

%___________CoVariance__________________
begInt = 1;
endInt =256;
l=endInt - begInt + 1;
arrayCovar = zeros(1,257);
j=1;
for k=1:256

coVar = 1/l *((A(k)*k) - (mean(A(k:j))*((begInt + endInt)/2)));
j= 1+k;
arrayCovar(k)=coVar;
end

coVariance = arrayCovar(:,1:256);
disp(coVariance)

Answer:

If you want to get the matrices to be displayed in each column, that's going to be ugly. If I'm interpreting your request correctly, you are concatenating row vectors so that they appear as a single row. That's gonna look pretty bad.

What I would suggest you do is split them up so that each row vector is separated per line. Use dlmwrite for that:

dlmwrite('data.txt', mean_2);
dlmwrite('data.txt', ' ', '-append');
dlmwrite('data.txt', mean_4, '-append');
dlmwrite('data.txt', ' ', '-append');
dlmwrite('data.txt', mean_8, '-append');
dlmwrite('data.txt', ' ', '-append');
dlmwrite('data.txt', std_2, '-append');
dlmwrite('data.txt', ' ', '-append');
dlmwrite('data.txt', std_4, '-append');
dlmwrite('data.txt', ' ', '-append');
dlmwrite('data.txt', std_8, '-append');
dlmwrite('data.txt', ' ', '-append');
dlmwrite('data.txt', coVariance, '-append');

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