/[escript]/trunk/paso/src/Functions.c
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Annotation of /trunk/paso/src/Functions.c

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Revision 1643 - (hide annotations)
Tue Jul 15 05:24:14 2008 UTC (11 years, 8 months ago) by phornby
File MIME type: text/plain
File size: 2157 byte(s)
Missing include file. A

ssume that a NULL F passed to Paso_FunctionCall() is an error.
1 gross 1476 /* $Id:$ */
2    
3     /*******************************************************
4     *
5     * Copyright 2008 by University of Queensland
6     *
7     * http://esscc.uq.edu.au
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     #include "Common.h"
15     #include "Functions.h"
16 gross 1639 #include "PasoUtil.h"
17 phornby 1643 #include "Solver.h"
18 gross 1476 /*
19     * numerical calculation of the directional derivative J0w if F at x0 in the direction w. f0 is the value of F at x0.
20     * setoff is workspace
21     */
22    
23     err_t Paso_FunctionDerivative(double* J0w, const double* w, Paso_Function* F, const double *f0, const double *x0, double* setoff)
24     {
25     err_t err=0;
26 gross 1639 dim_t n=F->n;
27 gross 1476 double norm_w,epsnew,norm_x0;
28     epsnew=10.*sqrt(EPSILON);
29     norm_w=Paso_l2(n,w,F->mpi_info);
30    
31     if (norm_w>0) {
32     Paso_zeroes(n,J0w);
33     } else {
34     epsnew = epsnew/norm_w;
35     norm_x0=Paso_l2(n,x0,F->mpi_info);
36     if (norm_x0>0) epsnew*=norm_x0;
37     Paso_LinearCombination(n,setoff,1.,x0,epsnew,w);
38     err=Paso_FunctionCall(F,J0w,setoff);
39 gross 1639 if (err==NO_ERROR) {
40 gross 1476 Paso_Update(n,1./epsnew,J0w,-1./epsnew,f0); /* J0w = (J0w - f0)/epsnew; */
41     }
42     }
43     return err;
44     }
45    
46 gross 1639 /*
47     * sets value=F(arg)
48     *
49     */
50 gross 1476 err_t Paso_FunctionCall(Paso_Function * F,double* value, const double* arg)
51     {
52 gross 1639 if (F!=NULL) {
53     switch(F->kind) {
54     case LINEAR_SYSTEM:
55     return Paso_Function_LinearSystem_call(F, value, arg);
56     case FCT:
57     return Paso_Function_FCT_call(F, value, arg);
58     default:
59     return SYSTEM_ERROR;
60     }
61     }
62 phornby 1643 /* Added by PGH, assume a null pointe is an error */
63     return SYSTEM_ERROR;
64 gross 1639 }
65     /*
66     * clear Paso_Function
67     */
68     void Paso_Function_free(Paso_Function * F) {
69     if (F!=NULL) {
70 gross 1476
71 gross 1639 switch(F->kind) {
72     case LINEAR_SYSTEM:
73     Paso_Function_LinearSystem_free(F);
74     break;
75     case FCT:
76     Paso_Function_FCT_free(F);
77     break;
78     default:
79     MEMFREE(F);
80     }
81     }
82 gross 1476 }

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