[Help-gsl] QR decomposition...

[Till Isambert]

hello,

i would like to perform a QR decomposition of a matrix S in GSL. The QR 
decomposition i would like to do should look like this :

S = QR = (Q1,Q2)·(R1 0)^t

i don't understand how to recover my matrix Q in Gsl once i use 
gsl_linalg_QR_decomp (or gsl_linalg_QRPT_decomp2 ??). Does somebody 
knows how to do this ?

thanks very much in advance,
cheers