Re: [Gretl-users] isnull for matrices

On Mon, 4 Mar 2013, Pindar wrote: > I encountered that a matrix that 'is null' cannot be filtered by 'isnull': (where the matrix in question exists but has zero rows and columns). As the help for isnull() states, this function "Returns 0 if name is the identifier for a currently defined object, be it a scalar, a series, a matrix, list, string or bundle; otherwise returns 1." So it correctly returns 1 for an empty (0 x 0) matrix.