Maxima Bug?



Hi,
iam a bit confused about matrix mutliplications.

multiplying 2 matrices normally results in a matrix.
But if multiplying a single row matrix with a single column matrix, the result is not a matrix but a scalar.

This leads to problems then further matrix operations are applied to the result of the above mentioned oparation.

T: genmatrix(t,2,2);
S: genmatrix(s,2,2);
T.S;
invert(T.S);
works.

T: genmatrix(t,1,2);
S: genmatrix(s,2,1);
T.S;
invert(T.S);
does not.

I stumbled about this while trying to implement some generic kalman.
But the script fails depending on input parameters allthough the math normmay is correct.

I think a matrix operation should allways produce a matrix.

Has somebody an idea to work around this in some generic way?

with best regards,
vlad