How to find the area under part of the histogram

Question

Joy Shen 2022-3-11

0
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https://ww2.mathworks.cn/matlabcentral/answers/1668974-how-to-find-the-area-under-part-of-the-histogram

回答： Paul 2022-3-11

Hi, I'm trying to find the area under part of a histogram? I'm aware that this gives me the total area under the histogram:

area = sum(h.Values)*h.BinWidth;

But I'm trying to find up to a certin edge, for example I want to find the area under the curve from bin edge 3 to bin edge 5. I know I'd have to take the difference to find that area between 3 and 5

Here's my code:

n = 1000000;
%Flow Area Lognormal Prior Assumption
lambda = 1; %Lognormal mean
zeta = 0.2; %Lognormal standard deviation - Subject to change!!! No justification yet
fa = lognrnd(lambda, zeta,n,1);
edges  = [0 3 7 15 50];
figure
h = histogram(fa,'Normalization','pdf');