Re: Axis rescaling: [was: Re: Quick refresh [was: q for quit in plot windows]]

[Ethan M. <merritt@u.washington.edu>]

On Thursday 28 June 2007 14:32, Daniel J Sebald wrote:
> Ethan Merritt wrote:
> > 
> > My request was simply that you leave the existing
> > log scale code in place until a general mechanism was ready to replace it.
> 
> What do you mean by general?  Able to apply mappings other than log scale?

Exactly.  I gave a bunch of examples earlier.
The most common request (and hardest to work around) is marking off the
X-axis as 1/x.   For instance, we crystallographers have to deal with 
inconsistent usage all the time;  some quantities are given in terms of
energy while others are given in terms of wavelength.  There is an
inverse relationship:
	Energy = k / Wavelength
where k is an appropriate constant.  It is a pain to try to persuade
gnuplot to mark off both Energy and Wavelength on axes of the same plot.

I would like to be able to do something like:

	set axis x1  x                 # will use for Energy
	set axis x2  k/x               # will use for Wavelength
	set axis y1  log(y)            # log scale value to be plotted

Even better if there is a way to automatically lock x1 to x2, so that
they are forced to span the same range.

-- 
Ethan A Merritt