Linear equations

["Katz, Adi" <Adi.Katz@harwell.cfx.aeat.com>]

Hello,

I amtrying to solve an underdetermind system of linear eqautions of the form: AX=b
where A is a mXn matrix with m<n . for example:

( 2 3  -4 ) (x1)      (b1)
( 1 -2 -5 ) (x2) =   (b2)
	  (x3)

I keep getting rank defficient exception although this system can be very easily solved using pen and paper.

How do I do it with Jama?

(solving with QR Decomposition did not help either)

Thanks,
Adi