Cleans matrices (round to zero small entries) (original) (raw)

Scilab 5.3.3

• Scilab help
• Polynomials
• bezout
• clean
• cmndred
• coeff
• coffg
• colcompr
• degree
• denom
• derivat
• determ
• detr
• diophant
• factors
• gcd
• hermit
• horner
• hrmt
• htrianr
• invr
• lcm
• lcmdiag
• ldiv
• numer
• pdiv
• pol2des
• pol2str
• polfact
• residu
• roots
• rowcompr
• sfact
• simp
• simp_mode
• sylm
• systmat

Please note that the recommended version of Scilab is 2026.0.1. This page might be outdated.
See the recommended documentation of this function

Scilab help >> Polynomials > clean

clean

cleans matrices (round to zero small entries)

Calling Sequence

B=clean(A [,epsa [,epsr]])

Arguments

A

a numerical matrix (scalar, polynomial, sparse...)

epsa,epsr

real numbers. Cleaning tolerances (default values resp. 1.d-10 and 1.d-10)

Description

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.

Examples

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))