matplotlib-users

[Matplotlib-users] setting grid density

[Philippe S. <phi...@pr...>]

Hello, I'm new to matplotlib and this list.
Congratulation to the developers of this great package, I've been looking
for
a long while for a good quality plotting package.

I would like to plot time in hours on the x axis, with one minor
grid per 15 minutes and one major grid per hour, but I can only see
10 fixed grids on all tutorial and documentation.

How can I configure that?

--
Philippe Strauss

Re: [Matplotlib-users] setting grid density

[John H. <jdh...@ac...>]

>>>>> "Philippe" == Philippe Strauss <phi...@pr...> writes:

    Philippe> Hello, I'm new to matplotlib and this list.
    Philippe> Congratulation to the developers of this great package,
    Philippe> I've been looking for a long while for a good quality
    Philippe> plotting package.

    Philippe> I would like to plot time in hours on the x axis, with
    Philippe> one minor grid per 15 minutes and one major grid per
    Philippe> hour, but I can only see 10 fixed grids on all tutorial
    Philippe> and documentation.

    Philippe> How can I configure that?

No support for minor and major ticks yet, but I can add it pretty
quickly, probably for the next release due out soon.  I just need a
little information.  How do grids interact with major and minor ticks?
I know major ticks are generally bigger and are labeled, and minor
ticks are smaller and not labeled, but I don't know how grid lines are
usually handled with respect to major and minor ticks.  If you have a
link to a canonical figure which uses major and minor ticks, I can
follow that example.

JDH

Re: [Matplotlib-users] setting grid density

[Philippe S. <phi...@pr...>]

From: "John Hunter" <jdh...@ac...
> >>>>> "Philippe" == Philippe Strauss <phi...@pr...> writes:
>
>     Philippe> Hello, I'm new to matplotlib and this list.
>     Philippe> Congratulation to the developers of this great package,
>     Philippe> I've been looking for a long while for a good quality
>     Philippe> plotting package.
>
>     Philippe> I would like to plot time in hours on the x axis, with
>     Philippe> one minor grid per 15 minutes and one major grid per
>     Philippe> hour, but I can only see 10 fixed grids on all tutorial
>     Philippe> and documentation.
>
>     Philippe> How can I configure that?
>
> No support for minor and major ticks yet, but I can add it pretty
> quickly, probably for the next release due out soon.  I just need a
> little information.  How do grids interact with major and minor ticks?
> I know major ticks are generally bigger and are labeled, and minor
> ticks are smaller and not labeled, but I don't know how grid lines are
> usually handled with respect to major and minor ticks.  If you have a
> link to a canonical figure which uses major and minor ticks, I can
> follow that example.
>
> JDH

for my application, I need something that looks like Tobias Oetiker
RRD tool graph:




This one is 1h per minor grid and tick, 6h per majors.

Thanks!!

Re: [Matplotlib-users] setting grid density

[John H. <jdh...@ac...>]

>>>>> "Philippe" == Philippe Strauss <phi...@pr...> writes:

    Philippe> This one is 1h per minor grid and tick, 6h per majors.

Hi Phillipe,

I just wanted to let you know that I've finished adding the major and
minor tick support for the next release of matplotlib.  There is
additional support for plotting dates and formatting dates with major
and minor ticks.  There are specialized tick locators for marking
ticks by minute, hour, day, weekday, month, year, every 4 hours, every
3 months, and so on.  There is a new command plot_date function and a
series of date converters to let you plot dates with, for example,
epochs, python datetimes or mx.Datetimes.  You can work with custom
date instances by supplying a custom converter.  You can format the
date ticks with strftime strings of your choice.

The major and minor tick support is generic and fully customizable and
should be useful for many other applications.

Look for the release next week.

JDH

Re: [Matplotlib-users] setting grid density

[Philippe S. <phi...@pr...>]

waouw thanks, that's an amazing support!

----- Original Message ----- 
From: "John Hunter" <jdh...@ac...>
To: "Philippe Strauss" <phi...@pr...>
Cc: <Mat...@li...>
Sent: Friday, April 16, 2004 3:49 AM
Subject: Re: [Matplotlib-users] setting grid density


> >>>>> "Philippe" == Philippe Strauss <phi...@pr...> writes:
>
>     Philippe> This one is 1h per minor grid and tick, 6h per majors.
>
> Hi Phillipe,
>
> I just wanted to let you know that I've finished adding the major and
> minor tick support for the next release of matplotlib.  There is
> additional support for plotting dates and formatting dates with major
> and minor ticks.  There are specialized tick locators for marking
> ticks by minute, hour, day, weekday, month, year, every 4 hours, every
> 3 months, and so on.  There is a new command plot_date function and a
> series of date converters to let you plot dates with, for example,
> epochs, python datetimes or mx.Datetimes.  You can work with custom
> date instances by supplying a custom converter.  You can format the
> date ticks with strftime strings of your choice.
>
> The major and minor tick support is generic and fully customizable and
> should be useful for many other applications.
>
> Look for the release next week.
>
> JDH

Re: [Matplotlib-users] setting grid density

[Al S. <a.d...@wo...>]

On Tue, 2004-04-13 at 10:12, John Hunter wrote:
> >>>>> "Philippe" == Philippe Strauss <phi...@pr...> writes:
> 
>     Philippe> Hello, I'm new to matplotlib and this list.
>     Philippe> Congratulation to the developers of this great package,
>     Philippe> I've been looking for a long while for a good quality
>     Philippe> plotting package.
> 
>     Philippe> I would like to plot time in hours on the x axis, with
>     Philippe> one minor grid per 15 minutes and one major grid per
>     Philippe> hour, but I can only see 10 fixed grids on all tutorial
>     Philippe> and documentation.
> 
>     Philippe> How can I configure that?
> 
> No support for minor and major ticks yet, but I can add it pretty
> quickly, probably for the next release due out soon.  I just need a
> little information.  How do grids interact with major and minor ticks?
> I know major ticks are generally bigger and are labeled, and minor
> ticks are smaller and not labeled, but I don't know how grid lines are
> usually handled with respect to major and minor ticks.  If you have a
> link to a canonical figure which uses major and minor ticks, I can
> follow that example.
> 
> JDH
> 

I've also been playing around with plots versus time (in my case
calendar time) and experimenting with tick style and ticklabel placement
computed as a function of the time span.

I attached a plot of one of my experiments. (This is where the need for
multi-line ticklabels comes from.)

The ticks and ticklabels that one wants differ according to the span of
time plotted. For instance, for multi-year plots, the ticks are no finer
than quarterly, but adjust to monthly, weekly, or daily if the span is
sub-year. The tick placement is, of course, not uniform, because of the
irregularities in the calendar.

I have not experimented with sub-day time-spans of the kind shown by
Philippe.

	-Al Schapira