If I have a set of data Y and a set of bins centered at X, I can use the HIST command to find how many of each Y are in each bin.
N = hist(Y,X)
What I would like to know is if there is a built in function that can tell me which bin each Y goes into, so
[N,I] = histMod(Y,X)
would mean that Y(I == 1) would return all the Y in bin 1, etc.
I know how to write this function, so I am only wondering if there is already a built-in in MATLAB that does this.
The related function histc
does this, but it requires you to define the bin edges instead of bin centers.
Y = rand(1, 10);
edges = .1:.1:1;
[N, I] = histc(Y, edges);
Computing the edges given the bincenters is easy too. In a one liner:
N = hist(Y, X);
becomes
[Nc, Ic] = histc(Y, [-inf X(1:end-1) + diff(X)/2, inf]);
with Nc == N, plus one extra empty bin at the end (since I assume no value in Y matches inf).
See doc histc
.