matplotlib-users

[Matplotlib-users] Vector Arrows in Image Plots

[Curtis C. <cu...@hi...>]

Hi,

I am excited about the relatively new imshow and pcolor features in
matplotlib.  I am using numarray to reduce/diagnose planetary atmospheres
simulations, which consist of temperature and velocity data on gridpoints
in longitude, latitude, and pressure.

In addition to contour plots, which is on the goals list for this project,
I would like a feature added that allows me to make velocity arrows
overlaying the pcolor or imshow images, as is common in meteorology maps.
Will such a feature be available in matplotlib, and if so, how soon?
Thanks for all the great work so far!

Cheers,
Curtis



      * * * * * * * * * * * * * * * * * * * * * * * * * * * *
    *   Curtis S. Cooper, Graduate Research Assistant         *
   *    Lunar and Planetary Laboratory, University of Arizona  *
   *    http://www.lpl.arizona.edu/~curtis/		       *
   *    Kuiper Space Sciences, Rm. 318                         *
    *   1629 E. University Blvd.,                             *
     *  Tucson, AZ 85721        * * * * * * * * * * * * * * *
      * Wk: (520) 621-1471     *
       * * * * * * * * * * * *

    'It is a great gift to have a beautiful mind but an even
     greater gift to discover a beautiful heart.`

	  --Akiva Goldsman
 (The Academy Award Winning Screenwriter of 'A Beautiful Mind`)

Re: [Matplotlib-users] Vector Arrows in Image Plots

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

>>>>> "Curtis" == Curtis Cooper <cu...@hi...> writes:

    Curtis> Hi, I am excited about the relatively new imshow and
    Curtis> pcolor features in matplotlib.  I am using numarray to
    Curtis> reduce/diagnose planetary atmospheres simulations, which
    Curtis> consist of temperature and velocity data on gridpoints in
    Curtis> longitude, latitude, and pressure.

    Curtis> In addition to contour plots, which is on the goals list
    Curtis> for this project, I would like a feature added that allows
    Curtis> me to make velocity arrows overlaying the pcolor or imshow
    Curtis> images, as is common in meteorology maps.  Will such a
    Curtis> feature be available in matplotlib, and if so, how soon?
    Curtis> Thanks for all the great work so far!

Hi  Curtis,

Actually this is on the goals page, listed as 2D vector plots - could
be more descriptive there.  So yes, it is a priority.  But I can't
really give an estimate at this point of when it will be done.

Working in your favor is that it should be fairly easy now that line
collections exist.  These were implemented in 0.54 and allow the fast
drawing of a bunch of independent line segments, which both contours
and vector fields have.  Now that the infrastructure exists to do
these efficiently, it makes it more likely that they will be added
sooner rather than later.  But there are a number of other equally important
features on the TODO list, which is why I don't have a definite
estimate.

As the goals page states

  Priorities can be changed in one of two ways: convincing one of the
  existing developers to make an item a higher priority (for example,
  if many users request the feature) or by helping to add the feature
  yourself (i.e., becoming a new developer).

You've just done option 1.  You're invited to try option 2!

Cheers,
JDH

Re: [Matplotlib-users] Vector Arrows in Image Plots

[Curtis C. <cu...@hi...>]

Mr. Hunter,

Thank you for your reply.  I am considering trying to develop the 2D
vector field plots myself using line collections, as you suggest.

Cheers,
Curtis


On Sat, 12 Jun 2004, John Hunter wrote:

> >>>>> "Curtis" == Curtis Cooper <cu...@hi...> writes:
>
>     Curtis> Hi, I am excited about the relatively new imshow and
>     Curtis> pcolor features in matplotlib.  I am using numarray to
>     Curtis> reduce/diagnose planetary atmospheres simulations, which
>     Curtis> consist of temperature and velocity data on gridpoints in
>     Curtis> longitude, latitude, and pressure.
>
>     Curtis> In addition to contour plots, which is on the goals list
>     Curtis> for this project, I would like a feature added that allows
>     Curtis> me to make velocity arrows overlaying the pcolor or imshow
>     Curtis> images, as is common in meteorology maps.  Will such a
>     Curtis> feature be available in matplotlib, and if so, how soon?
>     Curtis> Thanks for all the great work so far!
>
> Hi  Curtis,
>
> Actually this is on the goals page, listed as 2D vector plots - could
> be more descriptive there.  So yes, it is a priority.  But I can't
> really give an estimate at this point of when it will be done.
>
> Working in your favor is that it should be fairly easy now that line
> collections exist.  These were implemented in 0.54 and allow the fast
> drawing of a bunch of independent line segments, which both contours
> and vector fields have.  Now that the infrastructure exists to do
> these efficiently, it makes it more likely that they will be added
> sooner rather than later.  But there are a number of other equally important
> features on the TODO list, which is why I don't have a definite
> estimate.
>
> As the goals page states
>
>   Priorities can be changed in one of two ways: convincing one of the
>   existing developers to make an item a higher priority (for example,
>   if many users request the feature) or by helping to add the feature
>   yourself (i.e., becoming a new developer).
>
> You've just done option 1.  You're invited to try option 2!
>
> Cheers,
> JDH
>