libit

00001 /*
00002    libit - Library for basic source and channel coding functions
00003    Copyright (C) 2005-2008 Francois Cayre, Vivien Chappelier, Herve Jegou
00004 
00005    This library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Library General Public
00007    License as published by the Free Software Foundation; either
00008    version 2 of the License, or (at your option) any later version.
00009 
00010    This library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Library General Public License for more details.
00014 
00015    You should have received a copy of the GNU Library General Public
00016    License along with this library; if not, write to the Free
00017    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00018 */
00019 
00020 /*
00021   Source definition functions
00022   Copyright (C) 2005-2008 Vivien Chappelier, Herve Jegou
00023 */
00024 
00025 
00026 #ifndef __it_source_h
00027 #define __it_source_h
00028 
00029 #include <it/vec.h>
00030 
00031 /*--------------------------------------------------------------------*
00032  * Source Random number generator                                     *
00033  *--------------------------------------------------------------------*/
00034 
00035 /* generate a vector of random binary values with the given */
00036 /* probability for the 0 symbol */
00037 bvec source_binary (idx_t size, double p0);
00038 
00039 /* generate a vector of values uniformly distributed in [a,b[ */
00040 vec  source_uniform (idx_t size, double a, double b);
00041 ivec source_uniform_int (idx_t size, int a, int b);
00042 
00043 /* generate a vector of independent values drawn from a */
00044 /* gaussian distribution of given mean and standard deviation */
00045 vec  source_gaussian (idx_t size, double mean, double std);
00046 
00047 /* generate a stationnary random vector from a probability
00048    density function using the acceptance-rejection method.
00049    the pdf is assumed to be zero outside [a, b].
00050 */
00051 vec  source_pdf (idx_t size, double a, double b, it_function_t pdf,
00052        it_args_t args);
00053 
00054 /* Return a vector of size K of real values between 0 and 1           */
00055 #define source_uniform_01( K ) source_uniform( K, 0, 1 )
00056 
00057 /* Memoryless discrete source of length size defined by its stationary probabilities pdf */
00058 ivec source_memoryless (idx_t size, vec pdf);
00059 
00060 #endif
include/it/source.h
