Hi matplotlib-users!

OK, yeah, I’m pretty new to matplotlib/pylab… I played with biggles for a short while but, all (more than 3) my python-using associates in the astronomical community we saying matplotlib was the way of the future… So I started with matplotlib.

I would like to plot some points, y vs x on a graph. y containing simple values, x is an angle. plot(x, y) – that bit is fine, values as a function of angle. But what I need to do is then have an another labelling scheme on the upper x axes. This would be say, a distance, and so is simply a constant multiplied by the lower x. I figured there would be some way I could rescale the x-axis and write it at the top, but a way of accomplishing this I cannot find.

I have been playing with twinx a bit but not getting very far. It’s not that I want to plot 2 different datasets because the two are equivalent. Is it the non-existnt twiny() I am looking for? Or is there simply a way to redraw axes over the current ones with a certain range, that leaves the range in the first plot untouched? I have messed with twinx a bit and some of the discussion in the archive for this list but I can’t figure out how to do it…

Hope that makes sense? Sorry my first post was a beg for help

Matt

use tick top:

ax = twinx()

ax.xaxis.tick_top()

## ···

On Wed, 2007-03-21 at 18:17 +0100, Matthew Czesarski wrote:

Hi matplotlib-users!

OK, yeah, I'm pretty new to matplotlib/pylab... I played with biggles

for a short while but, all (more than 3) my python-using associates in

the astronomical community we saying matplotlib was the way of the

future... So I started with matplotlib.

I would like to plot some points, y vs x on a graph. y containing

simple values, x is an angle. plot(x, y) -- that bit is fine, values

as a function of angle. But what I need to do is then have an another

labelling scheme on the upper x axes. This would be say, a distance,

and so is simply a constant multiplied by the lower x. I figured there

would be some way I could rescale the x-axis and write it at the top,

but a way of accomplishing this I cannot find.

I have been playing with twinx a bit but not getting very far. It's

not that I want to plot 2 different datasets because the two are

equivalent. Is it the non-existnt twiny() I am looking for? Or is

there simply a way to redraw axes over the current ones with a certain

range, that leaves the range in the first plot untouched? I have

messed with twinx a bit and some of the discussion in the archive for

this list but I can't figure out how to do it...

Hope that makes sense? Sorry my first post was a beg for help

Matt

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