Save a variable from a for cycle into a matrix

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Miguel Albuquerque 2022-6-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1738970-save-a-variable-from-a-for-cycle-into-a-matrix

评论： Miguel Albuquerque 2022-6-12

Hey guys, this is probably very easy but Im having troubles.

I have a matrix range_compression(2032x400). Each row corresponds to a position of a radar and columns correspond to signals in frequency domain.

For each column I apply a function that transforms that signal to time domain. However the code I have is saving all of this in a vector 1x 2243277. And I would like to save it in a matrix 2032x400. Thank you all

[nr,mr]=size(Range_compression);
for i=1:mr
    [time_compression,range_compressed]=freq2time(i,doppler_freqSurv);
end
time_compression=time_compression*c;

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Answer 1

Image Analyst 2022-6-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1738970-save-a-variable-from-a-for-cycle-into-a-matrix#answer_984140

在 MATLAB Online 中打开

Maybe this:

[rows,columns]=size(Range_compression);
output = zeros(rows, columns);
for col = 1 : columns
    % Get a column
    thisColumn = Range_compression(:, col);
    % Convert it to time domain.
    [time_compression,range_compressed]=freq2time(col, thisColumn);
    % Save the output (whichever vector it is)
    output(:, col) = time_compression; % Or whatever...
end

If you have any more questions, then attach your data, the freq2time function, and code to read the data in with the paperclip icon after you read this:

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Miguel Albuquerque 2022-6-12

在 MATLAB Online 中打开

Thank you for helping me , With that code I get this error. I attached the variables and the function freq2time

[rows,columns]=size(Range_compression);
output = zeros(rows, columns);
for col = 1 : columns
    % Convert it to time domain.
    [time_compression,range_compressed]=freq2time(col, doppler_freqSurv);
    % Save the output (whichever vector it is)
    output(:, col) = range_compressed; % Or whatever...
end
Unable to perform assignment because the size of the left side is 2032-by-1 and the size of the right side is 1-by-2243277.