avrgae and standDev... Data should be vector Problem??

Question

ahmed 2013-10-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/104102-avrgae-and-standdev-data-should-be-vector-problem

评论： ahmed 2013-10-29

I am trying to plot the average and stand Dev for my lab data, I have like 8 text files (results), I did a loop to get all of them form file directory. Then import these data into matlab to able to work on them to obtain average values and StaDev. into plot.

each text file contains (3 C , 20 R). this the code to get the files form directory

dataDirectory = 'C:\Users\aam\Desktop\noies,';   
allFilesDir = dir(fullfile(dataDirectory , '*.txt'));
allFN = {allFilesDir.name};
for n = 1:length(allFN)
         Mat{n}=importdata(['' num2str(n) '.txt']);   
end

now all files imported in matlab

I am tring to use :

for x=1:3
   A(x)=(Mat{1,n}(1:20,x));
    histfit(A,5)
    xlabel('Noise (rms)');
    ylabel('Sample Number');
    [average,standdev] = normfit(A); % Fit of Distribution
    end

but i got this In an assignment A(I) = B, the number of elements in B and I must be the same.

or data should be vector

    histfit(Mat,5)
    xlabel('Noise (rms)');
    ylabel('Sample Number');
    [average,standdev] = normfit(Mat); % Fit of Distribution
    end

any ideass ???

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Image Analyst 2013-10-28

You forgot to (1) attach your m-file, (2) attach a sample data file, and most importantly (3) give us the actual error message, not some snipped or paraphrased error message but ALL of the red text. As it is, we don't know which line of code caused the error.

ahmed 2013-10-28