Error ellipsis for quivers?

Hi all,

I am looking for the possibility to plot quivers with error ellipsis
on the end, representing the uncertainty in a velocity measurement. I
looked around but I haven't found a functionality for that in pylab.
Is this available or how would I go about writing such a functionality?

Best regards,
Hanno

···

--
Hanno Klemm
klemm@...948...

Don't take this is a definitive answer, because this may be out of date... The quiver.py module contains the following comment at the top:

"""
This will also become a home for things such as standard
deviation ellipses, which can and will be derived very easily from
the Quiver code.
"""

...suggesting that this was planned but not yet implemented.

Cheers,
Mike

Hanno Klemm wrote:

···

Hi all,

I am looking for the possibility to plot quivers with error ellipsis
on the end, representing the uncertainty in a velocity measurement. I
looked around but I haven't found a functionality for that in pylab.
Is this available or how would I go about writing such a functionality?

Best regards,
Hanno

--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

Michael Droettboom wrote:

Don't take this is a definitive answer, because this may be out of date... The quiver.py module contains the following comment at the top:

"""
This will also become a home for things such as standard
deviation ellipses, which can and will be derived very easily from
the Quiver code.
"""

...suggesting that this was planned but not yet implemented.

Yes, I never got to it, and every time I look at quiver I think, "I should get that done." I will be needing it myself. If no one else does it, I will get to it--but probably in weeks, not days, since I am working on other things right now.

Eric

···

Cheers,
Mike

Hanno Klemm wrote:

Hi all,

I am looking for the possibility to plot quivers with error ellipsis
on the end, representing the uncertainty in a velocity measurement. I
looked around but I haven't found a functionality for that in pylab.
Is this available or how would I go about writing such a functionality?

Best regards,
Hanno

Eric,

if this is relatively straightforward, I might try and give it a shot.
However, at the moment, I don't even have a good idea how I get pylab
to draw an ellipsis given the two axes.

If you could point me into the right direction I might try and start
writing some first implementation of this thing.

Hanno

Eric Firing <efiring@...202...> said:

Michael Droettboom wrote:
> Don't take this is a definitive answer, because this may be out of
> date... The quiver.py module contains the following comment at

the top:

>
> """
> This will also become a home for things such as standard
> deviation ellipses, which can and will be derived very easily from
> the Quiver code.
> """
>
> ...suggesting that this was planned but not yet implemented.

Yes, I never got to it, and every time I look at quiver I think, "I
should get that done." I will be needing it myself. If no one else
does it, I will get to it--but probably in weeks, not days, since I am
working on other things right now.

Eric

>
> Cheers,
> Mike
>
> Hanno Klemm wrote:
>> Hi all,
>>
>> I am looking for the possibility to plot quivers with error ellipsis
>> on the end, representing the uncertainty in a velocity measurement. I
>> looked around but I haven't found a functionality for that in pylab.
>> Is this available or how would I go about writing such a

functionality?

···

>>
>> Best regards,
>> Hanno
>>
>>
>>
>

--
Hanno Klemm
klemm@...948...

Hanno Klemm wrote:

Eric,

if this is relatively straightforward, I might try and give it a shot.
However, at the moment, I don't even have a good idea how I get pylab
to draw an ellipsis given the two axes.

If you could point me into the right direction I might try and start
writing some first implementation of this thing.

Hanno,

Well, I would not say it is "relatively straightforward" unless you understand the code in quiver, and that may take some work. What is needed is very similar to the quiver code. Or at least that is the way I would approach it.

Eric

···

Hanno

Eric Firing <efiring@...202...> said:

Michael Droettboom wrote:

Don't take this is a definitive answer, because this may be out of date... The quiver.py module contains the following comment at

the top:

"""
This will also become a home for things such as standard
deviation ellipses, which can and will be derived very easily from
the Quiver code.
"""

...suggesting that this was planned but not yet implemented.

Yes, I never got to it, and every time I look at quiver I think, "I should get that done." I will be needing it myself. If no one else does it, I will get to it--but probably in weeks, not days, since I am working on other things right now.

Eric

Cheers,
Mike

Hanno Klemm wrote:

Hi all,

I am looking for the possibility to plot quivers with error ellipsis
on the end, representing the uncertainty in a velocity measurement. I
looked around but I haven't found a functionality for that in pylab.
Is this available or how would I go about writing such a

functionality?

Best regards,
Hanno

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