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<code>
#include <iostream>
#include <fstream>
#include <iomanip>
#include "channelflow/flowfield.h"
#include "channelflow/dns.h"
#include "channelflow/utilfuncs.h"
#include "channelflow/vector.h"
#include "channelflow/turbstats.h"

using namespace std;
using namespace channelflow;

int main(int argc, char* argv[]) {
  string purpose("take input Flowfield and write a file with energy density\n"
         "as a function of y, averaged over x and z");

  ArgList args(argc, argv, purpose);

  const string uname = args.getstr(2, "<fieldname>", "flowfield input file");
  const string afile = args.getstr(1, "<asciifile>", "ascii output file");

  args.check();

  FlowField u(uname);

  u.makeState(Physical, Physical);
  const int Nx = u.Nx();
  const int Ny = u.Ny();
  const int Nz = u.Nz();
  const int Nd = u.Nd();

  int p = 16;

  Vector e(Ny);
  int count = 0;

  for (int ny=0; ny<Ny; ++ny) {
    e[ny]=0;
    for (int nx=0; nx<Nx; ++nx) {
      for (int nz=0; nz<Nz; ++nz) {
    count++;
    for (int i=0; i<Nd; ++i) {
      e[ny]+=u(nx,ny,nz,i)*u(nx,ny,nz,i);
    }
      }
    }
  }
  ofstream os(appendSuffix(afile, ".asc").c_str());
  os << setprecision(p) << scientific;
  for (int ny_=0; ny_<Ny;++ny_) {
    e[ny_]=e[ny_]/(2*count);
    os << e[ny_] << '\n';
  }
}

</code>

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