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42cf5bc1ca
Automatic upgrade of OCCT code by command "occt_upgrade . -nocdl": - WOK-generated header files from inc and sources from drv are moved to src - CDL files removed - All packages are converted to nocdlpack
102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
// Copyright (c) 1997-1999 Matra Datavision
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// Copyright (c) 1999-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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//#ifndef OCCT_DEBUG
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#define No_Standard_RangeError
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#define No_Standard_OutOfRange
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#define No_Standard_DimensionError
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//#endif
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#include <math.hxx>
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#include <math_FunctionSet.hxx>
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#include <math_GaussSetIntegration.hxx>
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#include <math_Vector.hxx>
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#include <Standard_NotImplemented.hxx>
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#include <StdFail_NotDone.hxx>
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math_GaussSetIntegration::math_GaussSetIntegration(math_FunctionSet& F,
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const math_Vector& Lower,
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const math_Vector& Upper,
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const math_IntegerVector& Order)
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: Val(1, F.NbEquations()) {
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Standard_Integer NbEqua = F.NbEquations() , NbVar = F.NbVariables();
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Standard_Integer i;
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Standard_Boolean IsOk;
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math_Vector FVal1(1, NbEqua), FVal2(1, NbEqua), Tval(1, NbVar);
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// Verification
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Standard_NotImplemented_Raise_if(
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NbVar != 1 || Order.Value(Order.Lower()) > math::GaussPointsMax(),
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"GaussSetIntegration ");
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// Initialisations
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Done = Standard_False;
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Standard_Real Xdeb = Lower.Value( Lower.Lower() );
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Standard_Real Xfin = Upper.Value( Upper.Lower() );
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Standard_Integer Ordre = Order.Value(Order.Lower());
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Standard_Real Xm, Xr;
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math_Vector GaussP(1, Ordre), GaussW(1, Ordre);
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// Recuperation des points de Gauss dans le fichier GaussPoints.
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math::GaussPoints (Ordre, GaussP);
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math::GaussWeights (Ordre, GaussW);
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// Changement de variable pour la mise a l'echelle [Lower, Upper] :
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Xm = 0.5 * (Xdeb + Xfin);
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Xr = 0.5 * (Xfin - Xdeb);
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Standard_Integer ind = Ordre/2, ind1 = (Ordre+1)/2;
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if(ind1 > ind) { // odder case
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Tval(1) = Xm; // + Xr * GaussP(ind1);
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IsOk = F.Value(Tval, Val);
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if (!IsOk) return;
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Val *= GaussW(ind1);
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}
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else {
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Val.Init(0);
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}
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for (i=1; i<= ind; i++) {
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Tval(1) = Xm + Xr * GaussP(i);
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IsOk = F.Value(Tval, FVal1);
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if (!IsOk) return;
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Tval(1) = Xm - Xr * GaussP(i);
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IsOk = F.Value(Tval, FVal2);
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if (!IsOk) return;
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FVal1 += FVal2;
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FVal1 *= GaussW(i);
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Val += FVal1;
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}
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Val *= Xr;
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Done = Standard_True;
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}
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void math_GaussSetIntegration::Dump(Standard_OStream& o) const
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{
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o <<"math_GaussSetIntegration ";
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if (Done) {
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o << " Status = Done \n";
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o << "Integration Value = " << Val<<"\n";
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}
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else {
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o << "Status = not Done \n";
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}
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}
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