This seems to work as expected for square matrices. However, the example below accepts ([2,-2,-4],[-1,3,4]) as an answer, even though &cas('maxima','rank(matrix'.$submission.'^^2-matrix'.$submission.')') should generate an error in MAXIMA:(%i1) A:matrix([2,-2,-4],[-1,3,4]); [ 2 - 2 - 4 ] (%o1) [ ] [ - 1 3 4 ] (%i2) rank(A^^2 - A); MULTIPLYMATRICES: attempt to multiply nonconformable matrices. -- an error. To debug this try: debugmode(true);
It looks like maximareply() in lonmaxima.pm does not recognize this error message as an error message (it is only checking if there is "incorrect" in the reply). I guess the best solution would be to fix that, but maybe there is a way to tell if the result of the cas call makes sense or not (like testing if it is an integer), as a workaround.
Damien _______________________________________________ LON-CAPA-users mailing list LON-CAPA-users@mail.lon-capa.org http://mail.lon-capa.org/mailman/listinfo/lon-capa-users
