How to sum a portion of a row in a table and get a single value

How do I sum a portion of a row in a Matlab table and get a single value? For example assume that the row number is i and the columns to be summed are the columns (N+1)/2 to N. I can't seem to figure out how to use varfun to do this.

Answer 1

[Dave B]

To have sum apply to all elements of the array rather than across a particular dimension, you can use the 'all' flag. (Alternates that are common in old code: sum(sum(X)) or sum(X(:)) also work for a matrix X).

a=rand(10);
i = 4;
N = 5;
cols = (N+1)/2:N;

sum(a(i,cols),'all')

ans = 1.2780