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  • Committer: Bazaar Package Importer
  • Author(s): Torsten Werner
  • Date: 2005-01-09 22:58:21 UTC
  • mfrom: (1.1.1 upstream)
  • Revision ID: james.westby@ubuntu.com-20050109225821-473xr8vhgugxxx5j
Tags: 3.0-12
http://bugs.debian.org/255869
changed configure.in to build scilab's own malloc.o, closes: #255869

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man/linear/rcond.man
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.TH rcond 1 "April 1993" "Scilab Group" "Scilab Function"
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.so ../sci.an
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.SH NAME
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rcond -  inverse condition number
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.SH CALLING SEQUENCE
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.nf
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rcond(X) 
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.fi
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.SH PARAMETERS
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.TP
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X
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: real or complex square matrix
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.SH DESCRIPTION
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.Vb rcond(X)
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is an estimate for the reciprocal of the
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condition of \fVX\fR in the 1-norm.
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.LP
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If \fVX\fR is well conditioned, \fVrcond(X)\fR is close to 1.
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If not, \fVrcond(X)\fR is close to 0.
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.LP
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.Vb [r,z]=rcond(X)  
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sets \fVr\fR to \fVrcond(X)\fR and returns \fVz\fR such that
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.LP
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.Vb norm(X*z,1) = r*norm(X,1)*norm(z,1) 
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Thus, if \fVrcond\fR is small \fVz\fR is a vector in the kernel.
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.SH EXAMPLE
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.nf
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A=diag([1:10]);
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rcond(A)
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A(1,1)=0.000001;
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rcond(A)
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.fi
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.SH SEE ALSO
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svd, cond, inv
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