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.TH colcomp 1 "April 1993" "Scilab Group" "Scilab Function"
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colcomp - column compression, kernel, nullspace
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[W,rk]=colcomp(A [,flag] [,tol])
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: real or complex matrix
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: square non-singular matrix (change of basis)
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: integer (rank of \fVA\fR)
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Column compression of \fVA\fR: \fVAc = A*W\fR is
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\fVAc=[0,Af]\fR with \fVAf\fR full column rank,
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rank(\fVAf\fR) = rank(\fVA\fR) = \fVrk\fR.
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\fVflag\fR and \fVtol\fR are optional parameters: \fVflag = 'qr'\fR
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or \fV'svd'\fR (default is \fV'svd'\fR).
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\fVtol\fR = tolerance parameter (of order \fV%eps\fR as default value).
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The \fVma-rk\fR first columns of \fVW\fR span the kernel of \fVA\fR
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when \fVsize(A)=(na,ma)\fR
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A=rand(5,2)*rand(2,5);
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rowcomp, fullrf, fullrfk, kernel