histc problem in counting in particular bin

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Dammar Badu
Dammar Badu on 20 Oct 2021
Edited: Dammar Badu on 20 Oct 2021
Hello
For data = 0.1:0.02:0.3 and bins = 0.1:0.04:0.3. When I use histc(data, bins), I get histogram frequency = 2 2 2 2 2 1. which is correct.
But when I change bins upto 0.4, I mean bins = 0.1:0.04:0.4, then the histogram frequency = 2 2 3 1 2 1 0 0, which is not correct. It incorrectly counting upper bound in 3rd bin and missing lower bound in 4th bin.
I appreciate any help.

Accepted Answer

Matt J
Matt J on 20 Oct 2021
Edited: Matt J on 20 Oct 2021
You are assuming that the bin boundaries are calculated with infinite precision, which is impossible. Likewise your data is also not computed in perfect increments of 0.04.
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Dammar Badu
Dammar Badu on 20 Oct 2021
Thank you Matt, Walter and Image Analyst for clarification. It is very helpful.

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