Date: 2024-09-25T09:34:52+00:00

Actual source code: test2.c
slepc-3.21.2 2024-09-25
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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 the ring region.\n\n";

     13: #include <slepcrg.h>

     15: #define NPOINTS 11

     17: PetscErrorCode CheckPoint(RG rg,PetscReal re,PetscReal im)
     18: {
     19:   PetscInt       inside;
     20:   PetscScalar    ar,ai;

     22:   PetscFunctionBeginUser;
     23: #if defined(PETSC_USE_COMPLEX)
     24:   ar = PetscCMPLX(re,im);
     25: #else
     26:   ar = re; ai = im;
     27: #endif
     28:   PetscCall(RGCheckInside(rg,1,&ar,&ai,&inside));
     29:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Point (%g,%g) is %s the region\n",(double)re,(double)im,(inside>=0)?"inside":"outside"));
     30:   PetscFunctionReturn(PETSC_SUCCESS);
     31: }

     33: int main(int argc,char **argv)
     34: {
     35:   RG             rg;
     36:   RGType         rtype;
     37:   PetscInt       i;
     38:   PetscBool      triv;
     39:   PetscReal      re,im,radius,vscale,start_ang,end_ang,width,a,b,c,d;
     40:   PetscScalar    center,cr[NPOINTS],ci[NPOINTS];

     42:   PetscFunctionBeginUser;
     43:   PetscCall(SlepcInitialize(&argc,&argv,(char*)0,help));
     44:   PetscCall(RGCreate(PETSC_COMM_WORLD,&rg));

     46:   PetscCall(RGSetType(rg,RGRING));
     47:   PetscCall(RGIsTrivial(rg,&triv));
     48:   PetscCheck(triv,PETSC_COMM_WORLD,PETSC_ERR_PLIB,"Region should be trivial before setting parameters");
     49:   PetscCall(RGRingSetParameters(rg,2,PETSC_DEFAULT,0.5,0.25,0.75,0.1));
     50:   PetscCall(RGSetFromOptions(rg));
     51:   PetscCall(RGIsTrivial(rg,&triv));
     52:   PetscCheck(!triv,PETSC_COMM_WORLD,PETSC_ERR_PLIB,"Region should be non-trivial after setting parameters");
     53:   PetscCall(RGView(rg,NULL));
     54:   PetscCall(RGViewFromOptions(rg,NULL,"-rg_view"));

     56:   PetscCall(RGGetType(rg,&rtype));
     57:   PetscCall(RGRingGetParameters(rg,&center,&radius,&vscale,&start_ang,&end_ang,&width));
     58:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"%s region: \n  center=%g, radius=%g, vscale=%g\n  start angle=%g, end angle=%g, width=%g\n\n",rtype,(double)PetscRealPart(center),(double)radius,(double)vscale,(double)start_ang,(double)end_ang,(double)width));

     60:   PetscCall(CheckPoint(rg,3.0,0.3));
     61:   PetscCall(CheckPoint(rg,1.1747,0.28253));

     63:   PetscCall(RGComputeBoundingBox(rg,&a,&b,&c,&d));
     64:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"The bounding box is [%g,%g]x[%g,%g]\n",(double)a,(double)b,(double)c,(double)d));

     66:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Contour points: "));
     67:   PetscCall(RGComputeContour(rg,NPOINTS,cr,ci));
     68:   for (i=0;i<NPOINTS;i++) {
     69: #if defined(PETSC_USE_COMPLEX)
     70:     re = PetscRealPart(cr[i]);
     71:     im = PetscImaginaryPart(cr[i]);
     72: #else
     73:     re = cr[i];
     74:     im = ci[i];
     75: #endif
     76:     PetscCall(PetscPrintf(PETSC_COMM_WORLD,"(%.3g,%.3g) ",(double)re,(double)im));
     77:   }
     78:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\n"));

     80:   PetscCall(RGDestroy(&rg));
     81:   PetscCall(SlepcFinalize());
     82:   return 0;
     83: }

     85: /*TEST

     87:    test:
     88:       suffix: 1
     89:       args: -rg_ring_width 0.015

     91:    test:
     92:       suffix: 2
     93:       args: -rg_ring_width 0.015 -rg_scale 1.5

     95:    test:
     96:       suffix: 3
     97:       args: -rg_view draw:tikz:test2_3_ring.tikz
     98:       filter: cat - test2_3_ring.tikz
     99:       requires: !single

    101:    test:
    102:       suffix: 4
    103:       args: -rg_ring_width 0.015 -rg_ring_center 3 -rg_ring_radius 0.3 -rg_ring_vscale 1
    104:       requires: !single

    106:    test:
    107:       suffix: 5
    108:       args: -rg_ring_width 0.1 -rg_ring_center 0.35 -rg_ring_radius 0.86 -rg_ring_vscale 1 -rg_ring_startangle 0.75 -rg_ring_endangle 0.25

    110: TEST*/