Question

Hi I was wondering if there is any function library that lets me do this conveniently or if you have any suggestions as to how I might do this elegantly without writing lines and lines of code (which is what I ended up doing with ofstream).

Loop over i
   Loop over j
      Evaluate f(i*alpha,j);
      Write f to column i;

Something like this. I need to compare a hundred different eigenfunction of a QM problem and I rather not write a file per value of alpha, will make plotting easier as well.

I did google without any usuable results, appreciate any help 🙂

Answer 1

If your algorithm lets you to do this, refactor the loop to write row-wise:

Loop over j {
    Loop over i {
        Evaluate f(i*alpha, j);
        Write f to column i, <TAB>;
    }
    Write <CR><LF>
}