spielwiese
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Last change
on this file since 493c477 was
493c477,
checked in by Jens Schmidt <schmidt@…>, 27 years ago
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o header fixed
git-svn-id: file:///usr/local/Singular/svn/trunk@404 2c84dea3-7e68-4137-9b89-c4e89433aadc
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Property mode set to
100644
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File size:
674 bytes
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| 1 | /* emacs edit mode for this file is -*- C++ -*- */ |
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| 2 | /* $Id: cf_irred.cc,v 1.2 1997-06-19 12:24:26 schmidt Exp $ */ |
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| 3 | |
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| 4 | #include <config.h> |
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| 5 | |
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| 6 | #include "assert.h" |
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| 7 | |
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| 8 | #include "cf_defs.h" |
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| 9 | #include "canonicalform.h" |
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| 10 | #include "cf_random.h" |
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| 11 | |
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| 12 | static bool |
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| 13 | is_irreducible ( const CanonicalForm & f ) |
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| 14 | { |
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| 15 | CFFList F = factorize( f ); |
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| 16 | return F.length() == 1 && F.getFirst().exp() == 1; |
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| 17 | } |
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| 18 | |
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| 19 | CanonicalForm |
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| 20 | find_irreducible ( int deg, CFRandom & gen, const Variable & x ) |
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| 21 | { |
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| 22 | CanonicalForm result; |
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| 23 | int i; |
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| 24 | do { |
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| 25 | result = power( x, deg ); |
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| 26 | for ( i = deg-1; i >= 0; i-- ) |
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| 27 | result += gen.generate() * power( x, i ); |
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| 28 | } while ( ! is_irreducible( result ) ); |
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| 29 | return result; |
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| 30 | } |
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