86 lines
3.3 KiB
C
86 lines
3.3 KiB
C
/*************************************************************************
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* *
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* Open Dynamics Engine, Copyright (C) 2001,2002 Russell L. Smith. *
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* All rights reserved. Email: russ@q12.org Web: www.q12.org *
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* *
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* This library is free software; you can redistribute it and/or *
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* modify it under the terms of EITHER: *
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* (1) The GNU Lesser General Public License as published by the Free *
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* Software Foundation; either version 2.1 of the License, or (at *
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* your option) any later version. The text of the GNU Lesser *
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* General Public License is included with this library in the *
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* file LICENSE.TXT. *
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* (2) The BSD-style license that is included with this library in *
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* the file LICENSE-BSD.TXT. *
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* *
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* This library is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the files *
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* LICENSE.TXT and LICENSE-BSD.TXT for more details. *
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* *
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*************************************************************************/
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/* miscellaneous math functions. these are mostly useful for testing */
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#ifndef _ODE_MISC_H_
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#define _ODE_MISC_H_
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#include <ode/common.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* return 1 if the random number generator is working. */
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ODE_API int dTestRand(void);
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/* return next 32 bit random number. this uses a not-very-random linear
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* congruential method.
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*/
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ODE_API unsigned long dRand(void);
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/* get and set the current random number seed. */
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ODE_API unsigned long dRandGetSeed(void);
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ODE_API void dRandSetSeed (unsigned long s);
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/* return a random integer between 0..n-1. the distribution will get worse
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* as n approaches 2^32.
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*/
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ODE_API int dRandInt (int n);
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/* return a random real number between 0..1 */
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ODE_API dReal dRandReal(void);
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/* print out a matrix */
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#ifdef __cplusplus
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ODE_API void dPrintMatrix (const dReal *A, int n, int m, char *fmt = "%10.4f ",
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FILE *f=stdout);
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#else
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ODE_API void dPrintMatrix (const dReal *A, int n, int m, char *fmt, FILE *f);
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#endif
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/* make a random vector with entries between +/- range. A has n elements. */
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ODE_API void dMakeRandomVector (dReal *A, int n, dReal range);
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/* make a random matrix with entries between +/- range. A has size n*m. */
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ODE_API void dMakeRandomMatrix (dReal *A, int n, int m, dReal range);
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/* clear the upper triangle of a square matrix */
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ODE_API void dClearUpperTriangle (dReal *A, int n);
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/* return the maximum element difference between the two n*m matrices */
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ODE_API dReal dMaxDifference (const dReal *A, const dReal *B, int n, int m);
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/* return the maximum element difference between the lower triangle of two
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* n*n matrices */
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ODE_API dReal dMaxDifferenceLowerTriangle (const dReal *A, const dReal *B, int n);
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#ifdef __cplusplus
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}
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#endif
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#endif
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