How can I plot Histograms for multiple data

I have about 20 .mat data and I need a code to load all the data from a folder and calculate their histograms. cheers.

[Geoff Hayes]

Kemi - what have you tried so far? See load to load a mat data file, and hist to create the histogram.

Answer 1

[Image Analyst]

See the FAQ for code samples: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

Inside each loop call hist() and plot(). You might want to use a different color for each plot to distinguish them from each other.

[counts, binCenters] = hist(yourData, numberOfBins);
hold on;
plot(binCenters, counts, 'Color', rand(1,3));

[kemi]

Thanks very much for this solution. Could you please check for me if this code will work. I just put them together based on the FAQ I read.

       k = 1:20
       matFileName = sprintf('mat%d.mat', k);
       matData = load(matFileName);
       [counts,binCentres] = hist(matData, 100);
       hold on;
       plot(binCenters, counts, ' color', rand(1,3));
       end

[Image Analyst]

You need the word "for" before the k= line. And you will need to extract your image from matData since matData is a structure:

fieldnames(matData) % Display contents of matdata in command window
myData = matData.whateverYouCalledYourData;
[counts,binCentres] = hist(myData, 100);