Date: 2016-03-29T14:57:08+00:00

Actual source code: test2.c
slepc-3.6.3 2016-03-29
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      1: /*
      2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
      4:    Copyright (c) 2002-2015, Universitat Politecnica de Valencia, Spain

      6:    This file is part of SLEPc.

      8:    SLEPc is free software: you can redistribute it and/or modify it under  the
      9:    terms of version 3 of the GNU Lesser General Public License as published by
     10:    the Free Software Foundation.

     12:    SLEPc  is  distributed in the hope that it will be useful, but WITHOUT  ANY
     13:    WARRANTY;  without even the implied warranty of MERCHANTABILITY or  FITNESS
     14:    FOR  A  PARTICULAR PURPOSE. See the GNU Lesser General Public  License  for
     15:    more details.

     17:    You  should have received a copy of the GNU Lesser General  Public  License
     18:    along with SLEPc. If not, see <http://www.gnu.org/licenses/>.
     19:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     20: */

     22: static char help[] = "Test exponential function.\n\n";

     24: #include <slepcfn.h>

     28: int main(int argc,char **argv)
     29: {
     31:   FN             fn;
     32:   PetscScalar    x,y,yp,tau,eta,alpha,beta;
     33:   char           strx[50],str[50];

     35:   SlepcInitialize(&argc,&argv,(char*)0,help);
     36:   FNCreate(PETSC_COMM_WORLD,&fn);

     38:   /* plain exponential exp(x) */
     39:   FNSetType(fn,FNEXP);
     40:   FNView(fn,NULL);
     41:   x = 2.2;
     42:   SlepcSNPrintfScalar(strx,50,x,PETSC_FALSE);
     43:   FNEvaluateFunction(fn,x,&y);
     44:   FNEvaluateDerivative(fn,x,&yp);
     45:   SlepcSNPrintfScalar(str,50,y,PETSC_FALSE);
     46:   PetscPrintf(PETSC_COMM_WORLD,"  f(%s)=%s\n",strx,str);
     47:   SlepcSNPrintfScalar(str,50,yp,PETSC_FALSE);
     48:   PetscPrintf(PETSC_COMM_WORLD,"  f'(%s)=%s\n",strx,str);

     50:   /* exponential with scaling factors eta*exp(tau*x) */
     51:   FNSetType(fn,FNEXP);
     52:   tau = -0.2;
     53:   eta = 1.3;
     54:   FNSetScale(fn,tau,eta);
     55:   FNView(fn,NULL);
     56:   x = 2.2;
     57:   SlepcSNPrintfScalar(strx,50,x,PETSC_FALSE);
     58:   FNEvaluateFunction(fn,x,&y);
     59:   FNEvaluateDerivative(fn,x,&yp);
     60:   SlepcSNPrintfScalar(str,50,y,PETSC_FALSE);
     61:   PetscPrintf(PETSC_COMM_WORLD,"  f(%s)=%s\n",strx,str);
     62:   SlepcSNPrintfScalar(str,50,yp,PETSC_FALSE);
     63:   PetscPrintf(PETSC_COMM_WORLD,"  f'(%s)=%s\n",strx,str);

     65:   /* test FNGetScale */
     66:   FNGetScale(fn,&alpha,&beta);
     67:   PetscPrintf(PETSC_COMM_WORLD,"Parameters:\n - alpha: ");
     68:   SlepcSNPrintfScalar(str,50,alpha,PETSC_FALSE);
     69:   PetscPrintf(PETSC_COMM_WORLD,"%s ",str);
     70:   PetscPrintf(PETSC_COMM_WORLD,"\n - beta: ");
     71:   SlepcSNPrintfScalar(str,50,beta,PETSC_FALSE);
     72:   PetscPrintf(PETSC_COMM_WORLD,"%s ",str);
     73:   PetscPrintf(PETSC_COMM_WORLD,"\n");

     75:   FNDestroy(&fn);
     76:   SlepcFinalize();
     77:   return 0;
     78: }