basis.cc

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#include<iostream.h>
#include<math.h>
#include "basis.h"

// Constructor
Basis::Basis() {
  phi = new double[2];
  dphide = new double[2];
}

// Destructor
Basis::~Basis() {
  delete [] phi;
  delete [] dphide;
}

// Calculates a linear 1D basis
void Basis::getBasis(int gp, double *x, double *u) {
  int N = 2;
  if (gp==0) {eta=-sqrt(3)/sqrt(5); wt=5.0/9.0;}
  if (gp==1) {eta=0.0; wt=8.0/9.0;}
  if (gp==2) {eta=sqrt(3)/sqrt(5); wt=5.0/9.0;}

  // Calculate basis function and derivatives at nodel pts
  phi[0]=(1.0-eta)/2.0;
  phi[1]=(1.0+eta)/2.0;
  dphide[0]=-0.5;
  dphide[1]=0.5;

  // Caculate basis function and derivative at GP.
  dx=x[1]-x[0];
  xx=0.0;
  uu=0.0;
  duu=0.0;
  for (int i=0; i < N; i++) {
    xx += x[i] * phi[i];
    uu += u[i] * phi[i];
    duu += u[i] * dphide[i];
  }

  return;
}