How to find the area under part of the histogram

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');

Answer 1

[Paul]

Replace sum() with cumsum() and then subtract to get the area between two bins of interest?

doc cumsum