/[escript]/trunk/paso/src/Functions.c
ViewVC logotype

Contents of /trunk/paso/src/Functions.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1811 - (show annotations)
Thu Sep 25 23:11:13 2008 UTC (10 years, 11 months ago) by ksteube
File MIME type: text/plain
File size: 2154 byte(s)
Copyright updated in all files

1
2 /*******************************************************
3 *
4 * Copyright (c) 2003-2008 by University of Queensland
5 * Earth Systems Science Computational Center (ESSCC)
6 * http://www.uq.edu.au/esscc
7 *
8 * Primary Business: Queensland, Australia
9 * Licensed under the Open Software License version 3.0
10 * http://www.opensource.org/licenses/osl-3.0.php
11 *
12 *******************************************************/
13
14
15 #include "Common.h"
16 #include "Functions.h"
17 #include "PasoUtil.h"
18 #include "Solver.h"
19 /*
20 * numerical calculation of the directional derivative J0w if F at x0 in the direction w. f0 is the value of F at x0.
21 * setoff is workspace
22 */
23
24 err_t Paso_FunctionDerivative(double* J0w, const double* w, Paso_Function* F, const double *f0, const double *x0, double* setoff, const bool_t w_is_normalized, Paso_Performance* pp)
25 {
26 err_t err=0;
27 dim_t n=F->n;
28 double norm_w,epsnew,norm_x0;
29 epsnew=10.*sqrt(EPSILON);
30 if (! w_is_normalized) {
31 norm_w=Paso_l2(n,w,F->mpi_info);
32 } else {
33 norm_w=1.;
34 }
35
36 if (norm_w>0) {
37 epsnew = epsnew/norm_w;
38 norm_x0=Paso_l2(n,x0,F->mpi_info);
39 if (norm_x0>0) epsnew*=norm_x0;
40 Paso_LinearCombination(n,setoff,1.,x0,epsnew,w);
41 err=Paso_FunctionCall(F,J0w,setoff,pp);
42 if (err==NO_ERROR) {
43 Paso_Update(n,1./epsnew,J0w,-1./epsnew,f0); /* J0w = (J0w - f0)/epsnew; */
44 }
45 } else {
46 Paso_zeroes(n,J0w);
47 }
48 return err;
49 }
50
51 /*
52 * sets value=F(arg)
53 *
54 */
55 err_t Paso_FunctionCall(Paso_Function * F,double* value, const double* arg, Paso_Performance *pp)
56 {
57 if (F!=NULL) {
58 switch(F->kind) {
59 case LINEAR_SYSTEM:
60 return Paso_Function_LinearSystem_call(F, value, arg,pp);
61 default:
62 return SYSTEM_ERROR;
63 }
64 }
65 /* Added by PGH, assume a null pointe is an error */
66 return SYSTEM_ERROR;
67 }
68 /*
69 * clear Paso_Function
70 */
71 void Paso_Function_free(Paso_Function * F) {
72 if (F!=NULL) {
73
74 switch(F->kind) {
75 case LINEAR_SYSTEM:
76 Paso_Function_LinearSystem_free(F);
77 break;
78 default:
79 MEMFREE(F);
80 }
81 }
82 }

  ViewVC Help
Powered by ViewVC 1.1.26