How to calculate width and height of histogram

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Parul
Parul 2014-2-28
评论： Parul 2014-3-3
I have an image data, whose histogram , i am calculating through hist command(not imhist) and then i get two parameters: one centroid of the bin, and another is no. of pixels in a bin, i want to calculate height and width of each bin. Pls help

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Wayne King
Wayne King 2014-2-28
编辑：Wayne King 2014-2-28
I'm not sure I understand that information is returned by hist()
X = randn(100,1);
[N,bincntr] = hist(X);
Now you know the count in each bin and the bin centers.
To find the boundaries, you can just do
Dx = mean(diff(bincntr));
Now you get the intervals as [bincntr-Dx/2, bincntr+Dx/2]
They are all of width Dx and height equal to the corresponding N
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Wayne King
Wayne King 2014-2-28
So now bincntr should still be a vector, but N will be a matrix with each column the output of binning each column of the data matrix.
If you look across the rows of the matrix, N, you see the division among the bin centers given by the vector bincntr.
Parul
Parul 2014-3-3
I hv uploaded the pic, please go through the link given below. http://tinypic.com/r/2871y0j/8
and from its hist u will get to know, which height, width of the bin i am talking about..

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