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.TH clean 1 "April 1993" "Scilab Group" "Scilab Function"
.so ../sci.an
.SH NAME
clean - cleans matrices (round to zero small entries)
.SH CALLING SEQUENCE
.nf
[B]=clean(A [,epsa [,epsr]])
.fi
.SH PARAMETERS
.TP
A
: a numerical matrix (scalar, polynomial, sparse...)
.TP
epsa,epsr
: real numbers (default values resp. 1.d-10 and 1.d-10)
.SH DESCRIPTION
This function eliminates (i.e. set to zero) all the coefficients
with absolute value < \fVepsa\fR and relative value < \fVepsr\fR
(relative means relative w.r.t. 1-norm of coefficients)
in a polynomial (possibly matrix polynomial or rational
matrix).
.LP
Default values are \fVepsa=1.d-10\fR and \fVepsr=1.d-10;\fR
.LP
For a constant (non polynomial) matrix \fVclean(A,epsa)\fR sets to zero all
entries of \fVA\fR smaller than \fVepsa\fR.
.SH EXAMPLE
.nf
x=poly(0,'x');
w=[x,1,2+x;3+x,2-x,x^2;1,2,3+x]/3;
w*inv(w)
clean(w*inv(w))
.fi
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