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length(x), x a vector, matrix, or array or any other type of variable.

Keywords: variables, null variables
length(x) computes the total number of elements in the vector, matrix,
or array x.  The value of length(x) is prod(dim(x)).

If x is a NULL variable, length(x) = 0.

If x is a GRAPH variable or a macro, length(x) = 1.

If x is a structure, length(x) is a structure.  If xi is component i of
x, the component i of length(x) has the same component name and value

See also topics dim(), ndims(), ncomps(), 'NULL', 'graphs'.

Gary Oehlert 2003-01-15