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[Lapack] q r decomposition

i am at my first steps with maxima
i work with ubunutu 12
i try to get the qr decomposition
following what i encountered in the net
1) i load lapack
2) i have my matrix m (it has non zero determinant)
3) i write [q,r]:dgeqrf(m);
i get the answer "dgeqrf followed by the matrix

i checked that an other function , dgeev, works , so i think lapack 
compiled correctly

where is my mistake ?
thanks in advance

Patrick Teller

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