matplotlib-devel Mailing List for matplotlib

I have data that has error bars and upper limits. (Actually they are lower
limits, since the Y axis is in stellar magnitudes and is inverted.) My
suggestion is use a negative error value to indicate a limit in which case
an arrow would be drawn, instead of an error bar. This feature would only
apply to the case of asymmetric error bars and not to the symmetric case. I
can produce a patch if this suggestion is agreeable.
-- Paul

Hi John,
Attached is the Axes.xaxis_date(), yaxis_date() patch.
I implemented the suggestions you made, including the extra keyword args 
to plot_date().
I was happy to see the date_ticker_factory() function was so similar to 
what I'd implemented on my own. Great minds think alike, I guess.
Cheers,
Michael
On Mon, 3 Oct 2005, John Hunter wrote:
>>>>>> "Michael" writes:
>
> Michael> Hi John, I've been making spacecraft trajectory "Pork
> Michael> Chop Plots", a contour plot of a z-value (such amount of
> Michael> fuel required) over a range of Earth departure date
> Michael> x-values and Mars arrival date y-values.
>
> Michael> Since I needed dates on both x and y axes, it was useful
> Michael> for me to factor out the date locator/formatter selection
> Michael> code from plot_date() into two Axes methods: xaxis_date()
> Michael> and yaxis_date().
>
> Michael> The plot_date() implementation then becomes just a call
> Michael> to plot() followed by a call to xaxis_date().
>
> I think this is a good idea. A few suggestions
>
> matplotlib 0.84 / CVS already has the guts of plot_date factored out
> in date_ticker_factory
>
> locator, formatter = date_ticker_factory(span, tz)
>
> which appears to be the same thing as your chooseDateFmt. So you'll
> want to use that instead. Note also that matplotlib naming
> conventions for functions and methods is lower case and underscore
> separated.
>
> I think it would be useful to add the following kwargs to plot_date to
> support your funcitonality
>
>
> def plot_date(self, d, y, fmt='bo', tz=None,
> xdate=True, ydate=False, **kwargs):
>
> Michael> My current implementation is below. Is this
> Michael> general-purpose enough for me to submit? If so, I'll
> Michael> make up some diff files and mail them in.
>
> Yep, with the changes above this would be great.
>
> Thanks!
> JDH
>
-- 
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 Michael Brady Phone: 818-354-4957
 Jet Propulsion Laboratory (M/S 301-140L)
 4800 Oak Grove Drive
 Pasadena, CA 91109
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