Re: [ePiX-users] Histograms

[Andrew D. Hwang]

On Wed, 3 Jan 2007, Marcus D. Hanwell wrote:

> On an unrelated note is it currently possible to plot graphs on a log 
> scale at all? Or would I be best just modifying the data for now and 
> plotting log(y)? I would miss the tick marks as they get closer on the 
> log plots but could live with it for now.
With the current version (1.0.22/1.1rc1), the easiest way to perform log 
data plotting is probably something like this:

---(snip)---
// in source file preamble
P log_lin(double x, double y, double z=0)
{
  return P(log10(x), y, z);
}
...

// inside main(); myfile.dat has 4 columns
plot("myfile.dat", BOX, 4, 1, 2, 0, log_lin);
---(snip)---

I've put log_log, log_lin, and lin_log functions into "functions.*" for 
this purpose, and have added alternative syntax for plot functions, so 
that (e.g.)

plot("myfile.dat", BOX, 4, log_lin);

plots the first two columns, with the first column plotted logarithmically.
I'll add log-log and semi-log coordinate grids and logarithmic axis labels 
today, and hope to have a packaged version (or at least some patch files) 
by this evening.

--Andy

Andrew D. Hwang                 address@hidden
Department of Math and CS       http://mathcs.holycross.edu/~ahwang
College of the Holy Cross       (508) 793-2458 (Office: 320 Swords)
Worcester, MA, 01610-2395       (508) 793-3530 (fax)