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Re: [Matplotlib-users] 2 axes bar chart -- malformed header from script. Bad headerRe: colorbar with 2 different scales
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From: Eric F. <ef...@ha...> - 2009-04-06 22:14:50
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j bai wrote:
> Hi, P.Romero,
> Please let me know if you get this working. I am trying to do the same
> type of 2 axes bar chart. but I got error message.
> I am using regular bar ().
> the following is the email i sent a week ago. Eric, I did use the
> twinx(), but it gave errors.
>
> thanks in advance.
>
> Hi, everyone,
> I am a matplotlib beginner. I am trying to do a chart with 2 y axes
> using twinx()
> I keep getting error message "malformed header from script. Bad
> header= is masked in one or more l: test.cgi" when I do two bar
> charts on two axes. if I do one bar chart and one line chart, I wouldnt
> get the error.
> if I refresh the web page, the chart would show up.
> the following is my code.
>
> ...
> ax = self.fig.add_axes( self.rectMain, axisbg=self.axesBG)
> ticks = self.setTickInterval( 10, 0, buybackDataobj.sharesMax)
> ind = na.array(range(len(
> buybackDataobj.quarters)))
> majorFormatter = FormatStrFormatter('%2.1f')
> ax.yaxis.set_major_locator(MultipleLocator( ticks ) )
> ax.yaxis.set_major_formatter(majorFormatter)
> bar(ind, buybackDataobj.shares, self.barwidth,
> color=self.draw.color['DarkGreen'] )
Try making that ax.bar(...)
>
> t = arange(0, float(buybackDataobj.sharesMax), ticks )
> ax.set_ylim(0, buybackDataobj.sharesMax * 1.1)
> ax.set_xlim(0, ind[-1] + self.barwidth*2)
> ax.set_ylabel("Value Bought " + buybackDataobj.scale, fontsize =
> self.fontsize )
>
> ax.set_xticks(ind + self.barwidth)
>
> ax.set_xticklabels( buybackDataobj.quarters, fontsize =
> self.fontsize)
> setp( ax.get_xticklabels(), rotation = self.rotation,
> horizontalalignment='center', family=
> 'sans-serif', fontsize = self.xaxisfs )
>
> if buybackDataobj.charttype == 'sells':
>
> ax2 = twinx()
> #ax2.plot(ind + self.barwidth/2, buybackDataobj.sells,
> ls='-', marker ='.', ms=11, c='#FF3300') // I wouldnt get the error
> message if I do this
> plot
>
> bar(ind + self.barwidth, buybackDataobj.sells,
> self.barwidth, color='#FF3300' ) // malformed header from script. Bad
> header= is masked in one or more l: test.cgi
And make that one ax2.bar(...).
It sounds like you have a combined mpl and cgi problem here; maybe an
exception in mpl is triggering a cgi error. "malformed header from
script" is not coming from mpl. "is masked in one or more" probably is,
but you need to see the whole traceback to find out what the problem is.
So as a matter of strategy, separate the mpl from the cgi; make sure
your script runs without error in standalone mode. Stick to purely or
mostly OO style. You probably want to start with something like
import matplotlib
matplotlib.use("agg")
import pyplot as plt # e.g. if you want to use "fig = plt.figure()"
This makes sure you are using a non-interactive backend.
See
http://matplotlib.sourceforge.net/faq/howto_faq.html#matplotlib-in-a-web-application-server
Eric
> ax2.set_xticklabels(buybackDataobj.quarters, visible=False )
> ax2.set_ylim(buybackDataobj.sellsMin * 0.75,
> buybackDataobj.sellsMax * 1.1)
> ax2.set_ylabel("Insider Selling $" +
> buybackDataobj.sellsScale, verticalalignment='center', fontsize =
> self.fontsize)
>
> setp( ax2.get_yticklabels(), rotation = 0,
> horizontalalignment='left', family='sans-serif', fontsize=self.fontsize )
>
> .............
>
>
> On Mon, Apr 6, 2009 at 3:44 PM, Eric Firing <ef...@ha...
> <mailto:ef...@ha...>> wrote:
>
> P.Romero wrote:
> > Is it possible to create a colorbar with different scales on each
> side?
> >
> >
> >
> > Example:
> >
> > a temperature colorbar with celcius values on the left side and
> > farenheit values on the right side.
> >
> >
> >
> > If so, how could this be done?
>
> A colorbar is just an axes object with some customization of the ticks
> and labels, and with a pcolor plot inside. You could get your second
> scale using a technique similar to the twinx and twiny Axes methods; you
> can then use set_xlim or set_ylim so that the Fahrenheit range on the
> new axes matches the Celcius range on the old one.
>
> To get started, look at the source for the twinx/twiny methods.
>
> Eric
>
> >
> >
> >
> > Please help,
> >
> > Thanks,
> >
> > P.Romero
> >
> >
> >
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