[Maxima] Maxima: Linsolve.

[Constantine Frangos]

I am using linsolve() for the solution of linear equations. In the example 
below I want to express the solution as:

xsol = A . r

where r = matrix([%r1],[%r2])

and A = matrix([-a13/a11,-a12/a11],[0,1],[1,0])

Its not clear how to construct or extract the matrices A and r from the
list ysol.

Any assistance would be appreciated.

TIA

C. Frangos.

(%i513) ysol : linsolve([a11*x1+a12*x2+a13*x3],[x1,x2,x3]);

(%o513) [x1 = -(%r1*a13+%r2*a12)/a11,x2 = %r2,x3 = %r1]
(%i514)