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Amiga Format CD46 (1999-10-20)(Future Publishing)(GB)[!][issue 1999-12].iso
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sylm.8
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1999-09-16
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sylmX(1) Scilab Function sylmX(1)
NAME
sylm - Sylvester matrix
CALLING SEQUENCE
[S]=sylm(a,b)
PARAMETERS
a,b : two polynomials
S : matrix
DESCRIPTION
sylm(a,b) gives the Sylvester matrix associated to polynomials a and b,
i.e. the matrix S such that:
coeff( a*x + b*y )' = S * [coeff(x)';coeff(y)'].
Dimension of S is equal to degree(a)+degree(b).
If a and b are coprime polynomials then
rank(sylm(a,b))=degree(a)+degree(b)) and the instructions
u = sylm(a,b) eye(na+nb,1)
x = poly(u(1:nb),'z','coeff')
y = poly(u(nb+1:na+nb),'z','coeff')
compute Bezout factors x and y of minimal degree such that a*x+b*y = 1