[Matplotlib-users] converting data between axis [0, 1] and data coordinates [min data, max data]

[n g <ng...@gm...>]

Hello all,

I believe it is an easy thing to do but I haven't figured out how to convert
between coordinate systems using transData or transAxes.    Here is the
simple_plot.py

import numpy
import pylab

x = numpy.arange(0.0, 1.0+0.01, 0.01)
y = numpy.cos(2*2*numpy.pi*x)
pylab.plot(x, y)

Here I want to transform y1 to axis scale between 0 and 1.
Also, I want to transform axis scale, say 0.25, to a corresponding y value
in the data coordinates.

pylab.show()

Currently I am doing it manually scaling things with axis limits, etc.  I
believe the neat thing is to use the transforms api.  Can somebody explain
me how it is done with transforms?  I am using 0.98.1.

Thanks in advance,

Nihat