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polsub

Polynomial Subtraction

SYNOPSIS:

int maxpol, na, nb, nc;
double a[], b[], c[];

nc = max(na, nb);
polini( nc );
polsub( a, na, b, nb, c );



DESCRIPTION:

polsub( a, na, b, nb, c );  c = b - a,  nc = max(na, nb)

a, b, c are polynomials of degree na, nb, nc respectively.
The degree of a polynomial cannot exceed a run-time value MAXPOL.
An operation that attempts to use or generate a polynomial of higher degree may produce a result that suffers truncation at degree MAXPOL.
The value of MAXPOL is set by calling the function
polini( MAXPOL );

Each polynomial is represented by an array containing its coefficients, together with a separately declared integer equal to the degree of the polynomial. 
The coefficients appear in ascending order; that is,

                                        2                      na
a(x)  =  a[0]  +  a[1] * x  +  a[2] * x   +  ...  +  a[na] * x  .