Re: [Matplotlib-users] Stick Plot?

[Gökhan S. <gok...@gm...>]

To me arrows are always useful to see the direction of wind easily.
Since in meteorological convention barbs show where the wind is
blowing from, but in pilot convention (I might have made up this one
:)) in the opposite way.

Gökhan

On Wed, May 6, 2009 at 7:11 PM, Christopher Barker
<Chr...@no...> wrote:
> Gökhan SEVER wrote:
>> Mayavi has a quiver3d function
>> (http://code.enthought.com/projects/mayavi/docs/development/html/mayavi/auto/mlab_helper_functions.html#quiver3d)
>> if you want to go a fancier way :)
>
> which is cool, but I"m looking to plot a time series of a (2d) vector
> quantity at a single point.
>
>> Also what
>> you showed in your original post seem a little like wind-barbs, well
>> except without notches.
>
> yup -- stick plots are commonly used for wind data.
>
> -Chris
>
>
>> Gökhan
>>
>>
>>
>> On Wed, May 6, 2009 at 4:46 PM, Christopher Barker
>> <Chr...@no...> wrote:
>>> Eric Firing wrote:
>>>> Christopher Barker wrote:
>>>>> Has anyone used MPL to make stick plots? If so, can I borrow your code?
>>>> If no one volunteers anything, then I suggest using quiver(...,
>>>> headlength=0, headwidth=0, headaxislength=0), together with
>>>> quiverkey(...).  This will effectively give you a stick plot, with lots
>>>> of flexibility.
>>> Thanks, I was thinking that quiver() would get direction wrong, as the x
>>> and y scales are in totally different units, but it looks like that's
>>> not the case if you use the "angles" keyword:
>>>
>>> angles: [‘uv’ | ‘xy’ | array]
>>>     With the default ‘uv’, the arrow aspect ratio is 1, so that if
>>> U*==*V the angle of the arrow on the plot is 45 degrees CCW from the
>>> x-axis. With ‘xy’, the arrow points from (x,y) to (x+u, y+v).
>>> Alternatively, arbitrary angles may be specified as an array of values
>>> in degrees, CCW from the x-axis.
>>>
>>>  >  It could be implemented more efficiently in any of
>>>> several ways, but it would take work to do it well.
>>> I hope I'll get time to do that, but I don't really like quiver stick
>>> plots anyway. I prefer plots (that I don't know the name of) that:
>>>
>>>
>>> Time is on the x axis
>>>
>>> Magnitude of the velocity is the x axis
>>>
>>> At each data point, there is a dot, and the direction is given with a
>>> unit-length arrow originating at that dot, in the direction of the
>>> observation.
>>>
>>> I wrote a version of this a while back with the old MPL transforms
>>> mechanism, but haven't taken the time to translate it.
>>>
>>> -Chris
>>>
>>>
>>>
>>>
>>> --
>>> Christopher Barker, Ph.D.
>>> Oceanographer
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>
> --
> Christopher Barker, Ph.D.
> Oceanographer
>
> Emergency Response Division
> NOAA/NOS/OR&R            (206) 526-6959   voice
> 7600 Sand Point Way NE   (206) 526-6329   fax
> Seattle, WA  98115       (206) 526-6317   main reception
>
> Chr...@no...
>
>
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