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

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Revision 1639 - (show annotations)
Mon Jul 14 08:55:25 2008 UTC (11 years, 6 months ago) by gross
File MIME type: text/plain
File size: 2057 byte(s)


1 /* $Id:$ */
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 #include "PasoUtil.h"
17 /*
18 * numerical calculation of the directional derivative J0w if F at x0 in the direction w. f0 is the value of F at x0.
19 * setoff is workspace
20 */
21
22 err_t Paso_FunctionDerivative(double* J0w, const double* w, Paso_Function* F, const double *f0, const double *x0, double* setoff)
23 {
24 err_t err=0;
25 dim_t n=F->n;
26 double norm_w,epsnew,norm_x0;
27 epsnew=10.*sqrt(EPSILON);
28 norm_w=Paso_l2(n,w,F->mpi_info);
29
30 if (norm_w>0) {
31 Paso_zeroes(n,J0w);
32 } else {
33 epsnew = epsnew/norm_w;
34 norm_x0=Paso_l2(n,x0,F->mpi_info);
35 if (norm_x0>0) epsnew*=norm_x0;
36 Paso_LinearCombination(n,setoff,1.,x0,epsnew,w);
37 err=Paso_FunctionCall(F,J0w,setoff);
38 if (err==NO_ERROR) {
39 Paso_Update(n,1./epsnew,J0w,-1./epsnew,f0); /* J0w = (J0w - f0)/epsnew; */
40 }
41 }
42 return err;
43 }
44
45 /*
46 * sets value=F(arg)
47 *
48 */
49 err_t Paso_FunctionCall(Paso_Function * F,double* value, const double* arg)
50 {
51 if (F!=NULL) {
52 switch(F->kind) {
53 case LINEAR_SYSTEM:
54 return Paso_Function_LinearSystem_call(F, value, arg);
55 case FCT:
56 return Paso_Function_FCT_call(F, value, arg);
57 default:
58 return SYSTEM_ERROR;
59 }
60 }
61 }
62 /*
63 * clear Paso_Function
64 */
65 void Paso_Function_free(Paso_Function * F) {
66 if (F!=NULL) {
67
68 switch(F->kind) {
69 case LINEAR_SYSTEM:
70 Paso_Function_LinearSystem_free(F);
71 break;
72 case FCT:
73 Paso_Function_FCT_free(F);
74 break;
75 default:
76 MEMFREE(F);
77 }
78 }
79 }

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