clean — cleans matrices (round to zero small entries)
B=clean(A [,epsa [,epsr]])
a numerical matrix (scalar, polynomial, sparse...)
real numbers. Cleaning tolerances (default values resp. 1.d-10 and 1.d-10)
This function eliminates (i.e. set to zero) all the coefficients
with absolute value < epsa
or 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
.