[yt-dev] Issue #1009: Streamline plot callback may be transposed (yt_analysis/yt)

[Matthew Turk]

Hi Mike,

This is a great idea.  Something non-symmetric with very simple
analytic results would be perfect, particularly for this application
... I'm going through and adding answer tests for callbacks now, and
would be happy to add this on as well.  We could start with something
just going slightly off-diagonal, which should be enough to
demonstrate it's correct.

On Mon, Mar 30, 2015 at 5:16 PM, Michael Zingale
<michael.zingale at stonybrook.edu> wrote:
> Hi Matt, I've been thinking about the need for us to create some special
> verification datasets where we know what the right answer is, so we can test
> the various routines, like the streamline plot, to see if we get the
> expected plot.  These should be conceptually simple datasets (like a
> left-handed vortex of vectors) where we know what the result should look
> like.
>
> I had tried something earlier with a volume render dataset when I was
> playing with left/right handedness. In that case, I had simply made my
> dataset in NumPy as a cubic array and then fed it into yt -- that seems to
> be an easy route to testing these things.
>
> Mike
>
> On Mon, Mar 30, 2015 at 6:06 PM, Matthew Turk <issues-reply at bitbucket.org>
> wrote:
>>
>> New issue 1009: Streamline plot callback may be transposed
>>
>> https://bitbucket.org/yt_analysis/yt/issue/1009/streamline-plot-callback-may-be-transposed
>>
>> Matthew Turk:
>>
>> In debugging the streamline plot callback, I've run into something odd.
>> I'm hoping @jwise77 , who wrote it originally, might be able to chime in.
>>
>> It's not clear to me that we are doing "the right thing" since we have an
>> image plot which is using `origin='lower'` and a streamline plot that is
>> not.  Additionally, the x, y ordering requires us *not* to transpose the
>> resultant image buffers to get the right shape of our array, if we have a
>> non-unitary input buffer.
>>
>> In short, I think the inputs may be transposed but shouldn't be, and I'm
>> not sure the streamplot is right.
>>
>> Responsible: MatthewTurk
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>
>
>
>
> --
> Michael Zingale
> Associate Professor
>
> Dept. of Physics & Astronomy • Stony Brook University • Stony Brook, NY
> 11794-3800
> phone:  631-632-8225
> e-mail: Michael.Zingale at stonybrook.edu
> web: http://www.astro.sunysb.edu/mzingale
>
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