how to plot histogram

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Elysi Cochin
Elysi Cochin on 2 Jun 2022
Commented: Star Strider on 2 Jun 2022
I wanted to plot the histogram of the attached data with number of bins = 42
When i use
figure, imhist(HRGB,42)
I get just 2 vertical lines at 0 and 1.
Instead, how can i get histogram with number of bins 42, or is the below code correct?
h = histogram(HRGB,42);
Or is there a better way to plot the histogram of the attached data?
  3 Comments
Star Strider
Star Strider on 2 Jun 2022
If the image is a binary created by imbinarize or im2bw, there are only two values, 0 and 1.

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Accepted Answer

Chunru
Chunru on 2 Jun 2022
load Xdata
% whos
figure; imshow(Xdata);
unique(Xdata(:))'
ans = 1×19
0 1 4 16 17 20 21 22 24 25 26 32 33 36 37 38 40 41 42
imhist assumes Xdata in the range of [0,1]. Therefore you have only two bins for 0 & 1 with your data
figure;
imhist(Xdata, 42)
You can rescale the data:
figure;
imhist(rescale(Xdata), 42);
Or you can use hist
figure
hist(Xdata(:), 42)

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