[[tags: egg]]

gmp

  1. gmp
    1. Description
    2. Author
    3. Requirements
    4. Download
    5. Documentation
    6. Example
      1. Special functions
    7. Changelog
    8. License

Description

A chicken scheme interface to GNU MP 4.1

Author

Peter Keller

Requirements

Requires the syntax-case egg.

Download

gmp.egg

Documentation

The library is split into several parts, which may be loaded/required separately:

gmp_utils
Utility procedures
gmp_integer
Integer routines
gmp_float
Float routines
gmp_rational
Rational arithmetic routines
gmp_random
Random numbers

The library used finalizers to free storage associated with unreferenced GMP data.

In addition to the library, a validation program will be built and installed, named chicken_gmp_test. To test the GMP extension just enter

 $ gmp_test

This is a release of the GNU MP library version 4.1 interface for chicken scheme. It is a pretty comprehensive interface, but without any of the lowlevel functions (mpn_*).

Since the validation code is pretty extensive, it shouldn't take too much work to fix when later revisions of the MP library comes out.

Example

Here is a tiny example of the interface usage:

(require-extension gmp)

(let (	(mpz1 (make-mpz_t))
		(mpz2 (make-mpz_t))
		(mpz3 (make-mpz_t)))

	(mpz_init mpz1)
	(mpz_init mpz2)
	(mpz_init mpz3)

	(mpz_set_ui mpz2 6)
	(mpz_set_str mpz3 "7" 10)
	(mpz_mul mpz1 mpz2 mpz3)

	(print 
		"The answer to " 
		(mpz_get_str #f 10 mpz2) 
		" times "
		(mpz_get_str #f 10 mpz3) 
		" is " 
		(mpz_get_str #f 10 mpz1) 
		".")
	
	(mpz_clear mpz1)
	(mpz_clear mpz2)
	(mpz_clear mpz3))

For the high level functions that I have not implemented: mpf_get_d_2exp mpz_array_init _mpz_realloc mpz_get_d_2exp mpz_getlimbm mpz_import mpz_export mpf_random2, there exists a function that will warn you to stdout when you accidentily use them.

Special functions

Here is an example of how the special function mpf_get_str is handled:

(let (	(mpf1 (make-mpf_t))
		(exp_p (make-mp_exp_t_p)))

	(mpf_init mpf1)
	(mpf_set_ui mpf1 42)

	;; get a string representation placing the exponent into exp_p
	(mpf_get_str #f exp_p 10 10 mpf1)

	;; The ONLY way to see the exponent is to dereference the "pointer"
	;; that is exp_p
	(print "The exponent is " (deref-mp_exp_t_p exp_p) ".")

	(mpf_clear mpf1))

Changelog

License

 Copyright (C) 2002 Peter K. Keller
 
 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.
 
 This library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Lesser General Public License for more details.
 
 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

All files in this package are copyrighted (C) 2002 Peter K. Keller regardless if they actually say it or not at the top of the file.