[Help-gsl] Re: AX=B system of linear equations

[Jonny Taylor]

> I have to solve for X in AX=B where  A, X and B are matrices.
> Unfortunately A is a ``fat" matrix i.e. more number of columns than
> rows.
This means that your system is under-defined. There is no unique solution to 
the problem. What outcome are you looking for from the calculation? If it is 
helpful to you then you could add additional rows specifying further 
constraints on the solution (which could be as trivial as setting X[1] to zero, 
say...) in order to enable you to solve the problem for a square matrix A.