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00005 //               Epetra: Linear Algebra Services Package 
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00043 
00044 #include<iostream.h>
00045 #include<math.h>
00046 #include "basis.h"
00047 
00048 // Constructor
00049 Basis::Basis() {
00050   phi = new double[2];
00051   dphide = new double[2];
00052 }
00053 
00054 // Destructor
00055 Basis::~Basis() {
00056   delete [] phi;
00057   delete [] dphide;
00058 }
00059 
00060 // Calculates a linear 1D basis
00061 void Basis::getBasis(int gp, double *x, double *u) {
00062   int N = 2;
00063   if (gp==0) {eta=-sqrt(3)/sqrt(5); wt=5.0/9.0;}
00064   if (gp==1) {eta=0.0; wt=8.0/9.0;}
00065   if (gp==2) {eta=sqrt(3)/sqrt(5); wt=5.0/9.0;}
00066 
00067   // Calculate basis function and derivatives at nodel pts
00068   phi[0]=(1.0-eta)/2.0;
00069   phi[1]=(1.0+eta)/2.0;
00070   dphide[0]=-0.5;
00071   dphide[1]=0.5;
00072   
00073   // Caculate basis function and derivative at GP.
00074   dx=x[1]-x[0];
00075   xx=0.0;
00076   uu=0.0;
00077   duu=0.0;
00078   for (int i=0; i < N; i++) {
00079     xx += x[i] * phi[i];
00080     uu += u[i] * phi[i];
00081     duu += u[i] * dphide[i];
00082   }
00083 
00084   return;
00085 }
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