monomial.c File Reference

Fast implementation of monomials for multivariate polynomial rings. More...

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "monomial.h"

Defines
#define	_MON_EXP_LENGTH_(e)   ((e) < 10 ? 1 : (e) < 100 ? 2 : (e) < 1000 ? 3 : (e) < 10000 ? 4 : (e) < 100000 ? 5 : (e) < 1000000 ? 6 : (e) < 10000000 ? 7 : (e) < 100000000 ? 8 : (e) < 1000000000 ? 9 : 10)
Functions
uint32_t	_binom_ (uint32_t n, uint32_t k)
uint32_t	mon_degree (monomial_t op)
int32_t	mon_divides (monomial_t x, monomial_t y)
char *	mon_to_string (monomial_t x, const uint8_t n)
char *	mon_to_string_pretty (monomial_t x, const uint8_t n, const char *vars)
monomial_t	mon_from_string (char *str)
monomial_t *	mon_generate_by_degree (uint32_t *len, const uint8_t n, const uint32_t d)

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Detailed Description

Fast implementation of monomials for multivariate polynomial rings.

Author:

Sebastian Pancratz

Date:

Oct--Nov 2009

All methods support aliasing of their inputs and outputs unless explicitly stated otherwise.

Todo:

Implement further monomial orderings.

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Define Documentation

#define _MON_EXP_LENGTH_

(

e

)

((e) < 10 ? 1 : (e) < 100 ? 2 : (e) < 1000 ? 3 : (e) < 10000 ? 4 : (e) < 100000 ? 5 : (e) < 1000000 ? 6 : (e) < 10000000 ? 7 : (e) < 100000000 ? 8 : (e) < 1000000000 ? 9 : 10)

Number of digits (in base 10) for the exponent e.

Warning:

This macro possibly evaluates its arguments multiple times.

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Function Documentation

uint32_t _binom_	(	uint32_t	n,
		uint32_t	k
	)

Returns the binomial coefficient .

Special cases are handled as follows. If , returns . If or , returns .