Date: 2022-03-31T15:28:48+00:00

Actual source code: test9.c
slepc-3.17.0 2022-03-31
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      1: /*
      2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
      4:    Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain

      6:    This file is part of SLEPc.
      7:    SLEPc is distributed under a 2-clause BSD license (see LICENSE).
      8:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      9: */

     11: static char help[] = "Test logarithm function.\n\n";

     13: #include <slepcfn.h>

     15: int main(int argc,char **argv)
     16: {
     17:   FN             fn;
     18:   PetscScalar    x,y,yp,tau,eta;
     19:   char           strx[50],str[50];

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

     24:   /* plain logarithm log(x) */
     25:   FNSetType(fn,FNLOG);
     26:   FNView(fn,NULL);
     27:   x = 2.2;
     28:   SlepcSNPrintfScalar(strx,sizeof(strx),x,PETSC_FALSE);
     29:   FNEvaluateFunction(fn,x,&y);
     30:   FNEvaluateDerivative(fn,x,&yp);
     31:   SlepcSNPrintfScalar(str,sizeof(str),y,PETSC_FALSE);
     32:   PetscPrintf(PETSC_COMM_WORLD,"  f(%s)=%s\n",strx,str);
     33:   SlepcSNPrintfScalar(str,sizeof(str),yp,PETSC_FALSE);
     34:   PetscPrintf(PETSC_COMM_WORLD,"  f'(%s)=%s\n",strx,str);

     36:   /* logarithm with scaling factors eta*log(tau*x) */
     37:   FNSetType(fn,FNLOG);
     38:   tau = 0.2;
     39:   eta = 1.3;
     40:   FNSetScale(fn,tau,eta);
     41:   FNView(fn,NULL);
     42:   x = 2.2;
     43:   SlepcSNPrintfScalar(strx,sizeof(strx),x,PETSC_FALSE);
     44:   FNEvaluateFunction(fn,x,&y);
     45:   FNEvaluateDerivative(fn,x,&yp);
     46:   SlepcSNPrintfScalar(str,sizeof(str),y,PETSC_FALSE);
     47:   PetscPrintf(PETSC_COMM_WORLD,"  f(%s)=%s\n",strx,str);
     48:   SlepcSNPrintfScalar(str,sizeof(str),yp,PETSC_FALSE);
     49:   PetscPrintf(PETSC_COMM_WORLD,"  f'(%s)=%s\n",strx,str);

     51:   FNDestroy(&fn);
     52:   SlepcFinalize();
     53:   return 0;
     54: }

     56: /*TEST

     58:    test:
     59:       suffix: 1
     60:       nsize: 1
     61:       filter: grep -v "computing matrix functions"

     63: TEST*/