Re: [Gretl-devel] "catch" in a user-defined function

<output> ? catch mI = matI(mat) In regard to function matI: Warning: "catch" should not be used on calls to user-defined functions </output> This should be taken seriously. For "catch" to work reliably it must be applied directly to a built-in command or function. On return from a user-defined function it's too late to ensure integrity of gretl's state in case of error, so (although you may be OK in simple cases) problems such as you mention are to be expected. You should move the "catch" into the function where inv() is called. Here's one possible approach: <hansl> function matrix try_invert (matrix m, scalar *err) catch matrix ret = inv(m) err = $error if err ret = {} endif return ret end function mat = zeros(2,2) scalar err = 0 mI = try_invert(mat, &err) if !err printf "WORKS\n" else printf "FAILS\n" endif </hansl> And here's another: <hansl> function scalar try_invert (matrix m, matrix *minv) catch minv = inv(m) return $error end function mat = zeros(2,2) matrix minv err = try_invert(mat, &minv) if !err printf "WORKS\n" else printf "FAILS\n" endif </hansl> Allin _______________________________________________ Gretl-devel mailing list Gretl-devel(a)lists.wfu.edu http://lists.wfu.edu/mailman/listinfo/gretl-devel