I previously responded on the list to Nguyen Cong Minh <[email protected]>,
who wrote,
> I used some Mata functions, and used st_view() to get the matrix from
> data, then use st_subview() to get a submatrix from that matrix.
>
> ------ Mata code -------
>
> real matrix V, Yall, Xall
> neq = st_local("neqn")
> st_view(V,., tokens(varname))
> st_subview(Yall,V,.,(1\neq))
> st_subview(Xall,V,.,(neq+1\cols(V)))
>
> It reported the error:
> mysub(): 3250 type mismatch
> <istmt>: - function returned error
I said, "I wonder if the error is where Nguyen thinks it is because I see
nothing incorrect in the part of the program quoted," and then I went on to
suggest how Nguyen might track down the error.
Since then, Nick Cox privately wrote me and said, "-st_local()- returns a
string".
Which is to say, in the code above, variable neq is a string variable,
so in the st_subview calls, (1\neq) and (neg+q\cols(V)) are type
mismatches. The fix is to change
> neq = st_local("neqn")
to read
neq = strtoreal(st_local("neqn"))
That way, neq will be a real rather than a string variable.
-- Bill
[email protected]
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