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Computing The Sum Of Each Column
Syntax colsum(x)
See Also sum , colrange , colmean , colstd , colmad , colmse

Description
If x is an integer, real, double-precision, or complex matrix, returns a row vector with the same type and column dimension as x containing the sum of each column. If x is a logical matrix, returns an integer row vector (with the same column dimension as x) containing the number of "true" entries in each column.

Example
     x = [{0., 2., 4.}, {0., -1., 1.}]
     colsum(x)
returns
     [ 6 , 0 ]