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Save each output in one file

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Nur Farahin
Nur Farahin on 9 Jan 2023
Commented: Nur Farahin on 9 Jan 2023
Hi, anybody can help me from this code,
I want to save all peaksnr output into one .csv using writematrix, but this code only save one value into the .csv.
Is there any method i can use to make sure all the output save into one csv.
%% Here is my code
indir = uigerdir(cd, 'Select input folder');
directory = dir([indir, '\', '*.jpg']);
for i = 1 : length(directory)
filename = directory(i).name;
ref = imread([indir, '\', filename]);
A = imnoise(ref, 'salt & pepper', 0.02);
[peaksnr, snr] = psnr(A, ref);
fprintf('\n Peak-SNR Original : %0.4f',peaksnr);
fprintf('\n SNR Original : %0.4f \n',snr);
writematrix(peaksnr, sprintf('psnrO.csv',i+1))
end
Thank you for your help.

Accepted Answer

Nur Farahin
Nur Farahin on 9 Jan 2023
But, i've tried another solution an work for me as well.
indir = uigetdir(cd, 'Select input folder');
directory = dir([indir, '\', '*.jpg']);
for i = 1 : length(directory)
filename = directory(i).name;
ref = imread([indir, '\', filename]);
A = imnoise(ref, 'salt & pepper', 0.02);
[peaksnr, snr] = psnr(A, ref);
fprintf('\n Peak-SNR Original : %0.4f',peaksnr);
fprintf('\n SNR Original : %0.4f \n',snr);
writematrix(peaksnr,'psnrO.csv','WriteMode','append');
writematrix(snr,'snrO.csv','WriteMode','append');
end
just add the writemode and append argument, then the values will save all in one csv.

More Answers (2)

VBBV
VBBV on 9 Jan 2023
Edited: VBBV on 9 Jan 2023
writematrix(peaksnr, 'psnrO.xls','Sheet', i)
  5 Comments
VBBV
VBBV on 9 Jan 2023
Edited: VBBV on 9 Jan 2023
Yes, sheet argument is used with *.xls files. Once saved into Excel file, you can convert it to CSV file using saveas option. Is there a constraint for you to write only to csv files ?, BTW you can use delimiter option in writematrix function too, if the data to be written has text
Nur Farahin
Nur Farahin on 9 Jan 2023
Thank you for the answer.

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Image Analyst
Image Analyst on 9 Jan 2023
Try (untested)
% Ask user for folder.
indir = uigetdir(cd, 'Select input folder');
directory = dir(fullfile(indir, *.jpg'));
% Preallocate array for results.
peaksnr = zeros(length(directory), 1);
% Loop over all files, adding noise and then computing Peak SNR and SNR
for k = 1 : length(directory)
% Get this filename.
filename = fullfile(indir, directory(k).name);
% Read in image file from disk.
originalImage = imread(filename);
% Add noise
noisyImage = imnoise(originalImage, 'salt & pepper', 0.02);
% Compute SNR
[thisPSNR, thisSnr] = psnr(noisyImage, originalImage);
% Update progress in command window.
fprintf('\nPeak-SNR Original for "%s" (#%d of %d): %0.4f', ...
directory(i).name, k, length(directory), thisPSNR);
fprintf('\nSNR Original : %0.4f \n', thisSnr);
% Save this value into the master array.
peaksnr(k) = thisPSNR;
end
% Save all the values.
outputFileName = fullfile(indir, 'Peak SNR.xlsx');
writematrix(peaksnr, outputFileName);
  3 Comments
Image Analyst
Image Analyst on 9 Jan 2023
Uh, you threw away all the corrections and improvements I made to your code, like
  1. using fullfile(),
  2. saving all the values to a single array so that you don't have to slow down your code by calling writematrix twice inside the loop,
  3. better progress messages,
  4. more descriptive variable names,
  5. addition of lots of comments, etc.
OK, "not invented here" I guess.
Nur Farahin
Nur Farahin on 9 Jan 2023
I appreciated your improvement to my code, i am clearly understand very well. Thank you so much for helping me out. I am clearly understand very well and managed to run the code. Iam sorry if you feel your code is not invented. Hope you dont feel offended. Maybe someone else will need the code.

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