Extract values within a range in a for loop

I have a loop like this:

for i = 1:length(x)

xy = find(u==i | u>i & u<(i+1)); #xy should find indices of u within that range i.e u(i)>=i<u(i+1)

N(i) = length(xy) #giving me counts of i

end

but then, the last iteration (last value of i) will be wrong by this expression.

how do i correct this please?

Or any better suggestion (function) by which I can do this

Thanks a lot

Answer 1

[Walter Roberson]

histcounts or the older histc.

Note that the two functions have different results for values that are exactly equal to the last element of the vector of bins. histc uses a separate bin for values exactly equal to the last bin but histc makes it part of the previous bin.

[Sesilia Iileka]

Thank you, histc did it for me.

One more question please. Is it not possible to create vectors with the values (not just counts) belonging to each bin?

[Walter Roberson]

[~, bin] = histc(u, ....);
groups = accumarray(bin(:), u(:), [], @(v) {v});

This would return a cell array in each each entry is the original elements divided up according to the edge information. It is not assumed that the items to go into any one cell are contiguous in the input.

If the items that belong to any one cell are contiguous in the input then there are other approaches available.

[Sesilia Iileka]

This code has errors Roberson. Please check it again. Thanks

[Walter Roberson]

it worked when I tested it using appropriate edge information where I wrote the .... in the outline . however I was confused about which array had the edge information and which had the data to be partitioned.