axis on top for barh plot

Community matplotlib-users
1

Hi,

How can I put the bottom axis on top (or on top AND on bottom) for a barh plot?

I'm trying to mimic this, made with gnuplot:

  http://www.hep.wisc.edu/cms/comp/cmsprod/dCacheUserUsage.png

within matplotlib, and I've come close,

  http://www.hep.wisc.edu/cms/comp/cmsprod/diskUserUsage.png

Also, is it possible to just have grid lines in one direction (say, vertical), I don't think the horizontal grid is necessary.

Thanks for any help,
Mike

PS: Anyone who is interested, my script for making that is here,
  http://www.hep.wisc.edu/cms/comp/cmsprod/plotDiskUse.py

2

Hi,

How can I put the bottom axis on top (or on top AND on bottom) for a barh plot?

I’m trying to mimic this, made with gnuplot:

http://www.hep.wisc.edu/cms/comp/cmsprod/dCacheUserUsage.png

within matplotlib, and I’ve come close,

http://www.hep.wisc.edu/cms/comp/cmsprod/diskUserUsage.png

Also, is it possible to just have grid lines in one direction (say, vertical), I don’t think the horizontal grid is necessary.

Thanks for any help,

Mike

This example might work for your case:

http://matplotlib.sourceforge.net/examples/axes_grid/simple_axisline4.html?highlight=subplothost

You can disable lower x-axis ticks and labels by using --assuming you will try the example in an ipython -pylab

run simple_axisline4.py

ax = gca()

ax.xaxis.set_major_locator(pylab.NullLocator())

However this disable vertical grids as well. Maybe someone else can point you in the right direction for this.

···

On Fri, Nov 27, 2009 at 5:17 PM, Mike Anderson <mbanderson@…150…> wrote:

PS: Anyone who is interested, my script for making that is here,

http://www.hep.wisc.edu/cms/comp/cmsprod/plotDiskUse.py

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3

28/11/09 @ 00:17 (+0100), thus spake Mike Anderson:

Hi,

How can I put the bottom axis on top (or on top AND on bottom) for a barh plot?

I'm trying to mimic this, made with gnuplot:

  http://www.hep.wisc.edu/cms/comp/cmsprod/dCacheUserUsage.png

within matplotlib, and I've come close,

  http://www.hep.wisc.edu/cms/comp/cmsprod/diskUserUsage.png

Also, is it possible to just have grid lines in one direction (say, vertical), I don't think the horizontal grid is necessary.

It's somewhat counter-intuitive, but it can be done.
You have to create some "twin" axes with the "twiny" option,
then make the plot on the twin axes so it will use the
top axis. The bottom axis still have to be adjusted manually
to make it match the top one and remove the labels.

See this example:

import matplotlib.pyplot as plt
import matplotlib.ticker as ticker

data = [21, 17, 18, 15, 14, 11, 9, 8, 4, 6, 7, 4, 5, 1, 3, 2, 0, 0]
names = ['%s%s' % (a, b)
         for a in 'abcdefg' for b in 'abcdefg'][:len(data)]

xlim = (0, max(data)+2)

fig = plt.figure()
ax1 = fig.add_subplot(1,1,1)
ax2 = ax1.twiny()

# actual plot
ax2.barh(range(len(data)), data[::-1], 1, align='center', color='red')

# x-axis
ax2.set_xlim(xlim)
ax1.set_xlim(xlim)
ax1.xaxis.set_major_formatter(ticker.NullFormatter())

# y-axis
ax2.set_ylim(-0.5, len(data)-1+0.5)
ax2.yaxis.set_major_locator(ticker.FixedLocator(range(len(data))))
ax2.yaxis.set_major_formatter(ticker.FixedFormatter(names[::-1]))

# grid
ax2.set_axisbelow(True)
ax1.set_axisbelow(True)
ax1.grid(True)

plt.show()

If you want only a vertical grid, use
"ax1.xaxis.grid(True)" instead of "ax1.grid(True)".

Bye.