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unsigned Geom::valuation ( SBasis const &  a,
double  tol = 0 
) [inline]

Returns the degree of the first non zero coefficient.

Parameters:
a sbasis function
tol largest abs val considered 0
Returns:
first non zero coefficient

Definition at line 318 of file sbasis.h.

Referenced by compose_inverse().

                                        {
    unsigned val=0;
    while( val<a.size() &&
           fabs(a[val][0])<tol &&
           fabs(a[val][1])<tol ) 
        val++;
    return val;
}


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