how to plot histogram

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?

[KSSV]

What is your necessity?

[Elysi Cochin]

Appearance of the plot

[Star Strider]

If the image is a binary created by imbinarize or im2bw, there are only two values, 0 and 1.

Answer 1

[Chunru]

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)