/*SGPC: Simple Genetic Programming in C(c) 1993 by Walter Alden Tackett and Aviram Carmi  This code and documentation is copyrighted and is not in the public domain. All rights reserved.   - This notice may not be removed or altered.  - You may not try to make money by distributing the package or by using the   process that the code creates.  - You may not distribute modified versions without clearly documenting your   changes and notifying the principal author.  - The origin of this software must not be misrepresented, either by   explicit claim or by omission.  Since few users ever read sources,   credits must appear in the documentation.  - Altered versions must be plainly marked as such, and must not be   misrepresented as being the original software.  Since few users ever read   sources, credits must appear in the documentation.  - The authors are not responsible for the consequences of use of this    software, no matter how awful, even if they arise from flaws in it. If you make changes to the code, or have suggestions for changes,let us know!  (gpc@ipld01.hac.com)*/#ifndef lintstatic char mutation_c_rcsid[]="$Id: mutation.c,v 2.5 1993/04/22 07:39:12 gpc-avc Exp gpc-avc $";#endif/* * * $Log: mutation.c,v $ * Revision 2.5  1993/04/22  07:39:12  gpc-avc * Removed old log messages * * Revision 2.4  1993/04/14  04:54:06  gpc-avc * Finished mods for checkpointing * added format to write tree * * */#include <stdio.h>#include <malloc.h>#include <errno.h>#include "gpc.h"/* #define TRACEm */#ifdef ANSI_FUNCtree *mutate(  pop_struct	*pop,  tree 		*t  )#elsetree *mutate(pop, t)  pop_struct	*pop;  tree		*t;#endif{  int	mpt;  tree	*st, **stptr, *newst;  mpt = random_int(count_crossover_pts(t));#ifdef TRACEm  printf("mpt = %d\n",mpt);#endif  st = get_subtree(t, mpt);#ifdef TRACEm  printf("subtree to be replaced:\n");  write_tree(pop, st, pop[p].format, stdout);#endif  stptr = pointer_to_subtree(&t, st);  /* note: unlike Koza/Rice we call this with root_p == 0, allowing a     leaf to be substituted for the subtree we're snipping out */  newst = create_random_tree(pop, t->pop, pop[t->pop].max_mutant_depth, 0, 0);#ifdef TRACEm  printf("new subtree:\n");  write_tree(pop, newst, pop[p].format, stdout);#endif  free_tree(st);  *stptr = newst;  /* we return the value of t, since it may have changed */  return t;}#undef TRACEm