dp_mag

dp_mag(p)

:: Computes the sum of bit lengths of coefficients of a distributed polynomial.

return

integer

p

distributed polynomial

• This function computes the sum of bit lengths of coefficients of a distributed polynomial p. If a coefficient is non integral, the sum of bit lengths of the numerator and the denominator is taken.
• This is a measure of the size of a polynomial. Especially for zero-dimensional system coefficient swells are often serious and the returned value is useful to detect such swells.
• If ShowMag and Print for dp_gr_flags() are on, values of dp_mag() for intermediate basis elements are shown.

[221] X=dp_ptod((x+2*y)^10,[x,y])$
[222] dp_mag(X);
115

References

section dp_gr_flags, dp_gr_print.

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