help mata mm_nobs()
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Title

    mm_nobs() -- number of observations


Syntax

        real scalar mm_nobs(transmorphic matrix X, real colvector w)


Description

    mm_nobs() determines the number of observations from given data and
    weights. Essentially, mm_nobs() is a shortcut to

      rows(w)==1 ? rows(X)*w : colsum(w)


Remarks

    None.


Conformability

    mm_nobs(X)
            X:  r x c
            w:  r x 1 or 1 x 1
       result:  1 x 1


Diagnostics

    w should be non-missing and non-negative.


Source code

    mm_nobs.mata


Author

    Ben Jann, ETH Zurich, jann@soz.gess.ethz.ch


Also see

    Online:  help for moremata