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clean(1) Scilab Function clean(1)
NAME
clean - cleans matrices (round to zero small entries)
CALLING SEQUENCE
[B]=clean(A [,epsa [,epsr]])
PARAMETERS
A : a numerical matrix (scalar, polynomial, sparse...)
epsa,epsr
: real numbers (default values resp. 1.d-10 and 1.d-10)
DESCRIPTION
This function eliminates (i.e. set to zero) all the coefficients with abso-
lute value < epsa and relative value < epsr (relative means relative w.r.t.
1-norm of coefficients) in a polynomial (possibly matrix polynomial or
rational matrix).
Default values are epsa=1.d-10 and epsr=1.d-10;
For a constant (non polynomial) matrix clean(A,epsa) sets to zero all
entries of A smaller than epsa.
EXAMPLE
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))
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