How to write matlab program for histogram with out using hist function.

Question

REVU VARAPRASAD 2015-9-10

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回答： Walter Roberson 2021-8-18

    Xw = abs(fft(Xt));
    ki = hist(Xw,L)%%%L=bin lenth,Xw=1000 randam samples

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Answer 1

Image Analyst 2015-9-10

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在 MATLAB Online 中打开

Hint: use a for loop over all the elements in your array. Convert the value of the array into a bin number. Then increment the "counts" array at that bin number:

for k = 1 : length(Xw(:))
    binNumber = ...... (you do this part)
    counts(binNumber) = counts(binNumber) + 1;
end
bar(counts, 'FaceColor', 'b');

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Answer 2

Steven Lord 2015-9-10

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Easy. Call HISTCOUNTS or HISTOGRAM instead of HIST.

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Answer 3

rodrigo figueiredo 2021-8-18

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编辑：rodrigo figueiredo 2021-8-18

在 MATLAB Online 中打开

a[]=0;
for p =1 : ?? :length(Xt)
for k = 1 : floor(abs(fft(Xt)))
    a= [a Xt]
end
end 
nbins = 25;
h = histogram(a,nbins)

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Walter Roberson 2021-8-18

That code is a highly inefficient way of replicating the original Xt signal many times, and then taking a histogram of the repeated signal -- which is going to have the same relative portions as the original signal would have.

However, the original poster wants to take a histogram of the fft output, rather than having the mean() of the signal determine how many copies of the original signal to make.

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