matplotlib-users Mailing List for matplotlib

On Fri, Mar 8, 2013 at 3:46 PM, Tejashri Kandolkar <
tej...@gm...> wrote:

> Thanks Christoph, thanks for the help.
>
> However I found the issue.
> The issue is that somehow matplotlib_release variant linked to the debug
> lib of libpng.
> And so on a non-developer machine, which dosent have msvcr90d.dll (debug
> crt), DLL Load fails.
>
> So now I have another question:
>
> I have built the static libs of freetype, libpng (and zlib which is
> required by libpng) from source
> And I mention the paths of these static libs in setupext.py (by modifying
> "basedir") while building matplotlib.
>
> Now when matplotlib builds, and generates a _png.pyd, will it still need
> the static libs to be present in the location where the _png.pyd is present?
> What I understand is that it shouldn't since it is a static library and
> should be built into the binary.
>
> Why I am asking this is because I am unable to build the libpng DLLs (for
> some reason I dont know).
> So I have to go forward with the static lib approach.
>
> Thanks,
> Regards,
> Tej.
>
>
> On Thu, Mar 7, 2013 at 10:53 PM, Christoph Gohlke <cg...@uc...> wrote:
>
>> On 3/7/2013 8:39 AM, Christoph Gohlke wrote:
>> > On 3/7/2013 6:00 AM, Tejashri Kandolkar wrote:
>> >> Hi,
>> >>
>> >> I built matplotlib1.2.0 with python3.2 on Windows7 from source.
>> >> I built the libpng and freetype libs and linked them statically to
>> >> matplotlib.
>> >>
>> >> Everything works fine on my machine, I can run the matplotlib examples
>> etc
>> >> But on a new Win7 machine(with the exact same configuration as mine,
>> >> except a few softwares), I get the following error when i try to import
>> >> png module like this:
>> >>
>> >> import matplotlib._png
>> >>
>> >> ImportError: DLL load failed: The application has failed to start
>> >> because its side-by-side configuration is incorrect. Please see the
>> >> application event log or use the command-line sxstrace.exe tool for
>> more
>> >> detail.
>> >>
>> >>
>> >> I used the dependency walker and found that pyd_ DLL was indeed having
>> >> issues during load.
>> >>
>> >> What could be the reason. Surprisingly it works all fine on my machine.
>> >>
>> >>
>> >> Regards,
>> >> Tej
>> >>
>> >
>> > Assuming this is 32 bit Python, install the Microsoft Visual C++ 2008
>> > Redistributable Package (x86) <from
>> > http://www.microsoft.com/en-us/download/details.aspx?id=29>
>> >
>>
>> Besides that, look for extra msvcp90.dll or msvcr90.dll files in PATH
>> (for example MikteX is known for that) and resolve conflicts.
>>
>> Christoph
>>
>>
>> ------------------------------------------------------------------------------
>> Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester
>> Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the
>> endpoint security space. For insight on selecting the right partner to
>> tackle endpoint security challenges, access the full report.
>> http://p.sf.net/sfu/symantec-dev2dev
>> _______________________________________________
>> Matplotlib-users mailing list
>> Mat...@li...
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>>
>
>

On 8 March 2013 03:19, Brickle Macho <bri...@gm...> wrote:

> On 8/03/13 8:37 AM, Damon McDougall wrote:
> > Correct me if I'm wrong, but would a 2D quiver plot on top of a
> > contour plot work?  What spaces does the surface map to/from?  If your
> > surface can be expressed as a function f:R^2 -> R then it's equivalent
> > to look at its level sets, rather than the 3D picture.  You can then
> > project the surface normals onto the plane and plot them with a 2D
> > quiver plot.  If you want to keep the z-component information, then
> > you could colour the arrows according to the angle they make with the
> > x-y plane.
> >
> > Does that make sense?
>
> My source is an image, so technically f:R^2 -> R.  Specifically I am
> using depth maps or (range image) what to visualise the
> surfaces/normals.   I was  planing on plotting the image as surface
> (hadn't work out how yet) and overlay the normal vectors.  I think a 2D
> quiver plot on top of a contour plot may provide a useful
> visualisation/interpretation of the process.
>

You always have the solution to install mayavi, a 3D plotting library. The
API resemble maptlotlib's and it supports 3D quiver plots.

Cheers,
N


>
> Thanks for the idea.
>
> Brickle.
> --
>
>
>
>
> >
> > I put the original feature request in, and I think it would be useful,
> > but often I still find it easier to process two dimensional
> > information.
> >
> > N.B.  The above will only work for *functions* f:R^2 -> R.  To
> > clarify, a sphere cannot be expressed this way, because the resulting
> > mapping would be multivalued.  Using this method, two distinct surface
> > normals may have the same colour.
> >
> > Hope that makes sense.
> >
> > Best wishes,
> > Damon
> >
> >> Brickle.
> >> --
> >>
> >>
> >> On 8/03/13 5:43 AM, Benjamin Root wrote:
> >>
> >>
> >>
> >> On Thu, Mar 7, 2013 at 4:25 PM, Eric Firing <ef...@ha...> wrote:
> >>> On 2013/03/07 9:19 AM, Benjamin Root wrote:
> >>>>
> >>>> On Thu, Mar 7, 2013 at 2:14 PM, Brickle Macho <bri...@gm...
> >>>> <mailto:bri...@gm...>> wrote:
> >>>>
> >>>>      I have a list of surface normals I would like to plot.  Is there
> a
> >>>> way
> >>>>      to plot a 3D vectors in matplotlib similar to how quiver plots 2D
> >>>>      vectors?
> >>>>
> >>>>
> >>>> Not at this time, but that would make a great feature request!  I
> think
> >>>> the current roadblock to such a function is a bug with converting 2d
> >>>> arrow objects into 3d arrows.
> >>> Quiver uses a PolyCollection, and I see that there is a
> Poly3DCollection.
> >>>
> >>> Eric
> >>>
> >>>> Ben Root
> >>>
> >> Took a bit of digging, but I knew I remembered this question before:
> >>
> >>
> http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CDMQFjAA&url=http%3A%2F%2Fmatplotlib.1069221.n5.nabble.com%2F2D-Quiver-in-Axes3D-td27944.html&ei=Pwk5UfGdLufv0QHuroD4BA&usg=AFQjCNEqlWv2vY5l2IPcje-g6B0U21wDNw&bvm=bv.43287494,d.dmQ
> >>
> >> And the feature request is here:
> >> https://github.com/matplotlib/matplotlib/issues/1026
> >>
> >> In the thread I pointed out a bug that I encountered.  I really hope I
> get
> >> some free time soon so that I can work on the various feature requests
> in
> >> mplot3d.
> >>
> >> Cheers!
> >> Ben Root
> >>
> >>
> >>
> >>
> ------------------------------------------------------------------------------
> >> Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester
> >> Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the
> >> endpoint security space. For insight on selecting the right partner to
> >> tackle endpoint security challenges, access the full report.
> >> http://p.sf.net/sfu/symantec-dev2dev
> >>
> >>
> >>
> >> _______________________________________________
> >> Matplotlib-users mailing list
> >> Mat...@li...
> >> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> >>
> >>
> >>
> >>
> ------------------------------------------------------------------------------
> >> Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester
> >> Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the
> >> endpoint security space. For insight on selecting the right partner to
> >> tackle endpoint security challenges, access the full report.
> >> http://p.sf.net/sfu/symantec-dev2dev
> >> _______________________________________________
> >> Matplotlib-users mailing list
> >> Mat...@li...
> >> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> >>
> >
> >
>
>
>
> ------------------------------------------------------------------------------
> Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester
> Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the
> endpoint security space. For insight on selecting the right partner to
> tackle endpoint security challenges, access the full report.
> http://p.sf.net/sfu/symantec-dev2dev
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>

On 8/03/13 8:37 AM, Damon McDougall wrote:
> Correct me if I'm wrong, but would a 2D quiver plot on top of a
> contour plot work?  What spaces does the surface map to/from?  If your
> surface can be expressed as a function f:R^2 -> R then it's equivalent
> to look at its level sets, rather than the 3D picture.  You can then
> project the surface normals onto the plane and plot them with a 2D
> quiver plot.  If you want to keep the z-component information, then
> you could colour the arrows according to the angle they make with the
> x-y plane.
>
> Does that make sense?

My source is an image, so technically f:R^2 -> R.  Specifically I am 
using depth maps or (range image) what to visualise the 
surfaces/normals.   I was  planing on plotting the image as surface 
(hadn't work out how yet) and overlay the normal vectors.  I think a 2D 
quiver plot on top of a contour plot may provide a useful 
visualisation/interpretation of the process.

Thanks for the idea.

Brickle.
--




>
> I put the original feature request in, and I think it would be useful,
> but often I still find it easier to process two dimensional
> information.
>
> N.B.  The above will only work for *functions* f:R^2 -> R.  To
> clarify, a sphere cannot be expressed this way, because the resulting
> mapping would be multivalued.  Using this method, two distinct surface
> normals may have the same colour.
>
> Hope that makes sense.
>
> Best wishes,
> Damon
>
>> Brickle.
>> --
>>
>>
>> On 8/03/13 5:43 AM, Benjamin Root wrote:
>>
>>
>>
>> On Thu, Mar 7, 2013 at 4:25 PM, Eric Firing <ef...@ha...> wrote:
>>> On 2013/03/07 9:19 AM, Benjamin Root wrote:
>>>>
>>>> On Thu, Mar 7, 2013 at 2:14 PM, Brickle Macho <bri...@gm...
>>>> <mailto:bri...@gm...>> wrote:
>>>>
>>>>      I have a list of surface normals I would like to plot.  Is there a
>>>> way
>>>>      to plot a 3D vectors in matplotlib similar to how quiver plots 2D
>>>>      vectors?
>>>>
>>>>
>>>> Not at this time, but that would make a great feature request!  I think
>>>> the current roadblock to such a function is a bug with converting 2d
>>>> arrow objects into 3d arrows.
>>> Quiver uses a PolyCollection, and I see that there is a Poly3DCollection.
>>>
>>> Eric
>>>
>>>> Ben Root
>>>
>> Took a bit of digging, but I knew I remembered this question before:
>>
>> http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CDMQFjAA&url=http%3A%2F%2Fmatplotlib.1069221.n5.nabble.com%2F2D-Quiver-in-Axes3D-td27944.html&ei=Pwk5UfGdLufv0QHuroD4BA&usg=AFQjCNEqlWv2vY5l2IPcje-g6B0U21wDNw&bvm=bv.43287494,d.dmQ
>>
>> And the feature request is here:
>> https://github.com/matplotlib/matplotlib/issues/1026
>>
>> In the thread I pointed out a bug that I encountered.  I really hope I get
>> some free time soon so that I can work on the various feature requests in
>> mplot3d.
>>
>> Cheers!
>> Ben Root
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester
>> Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the
>> endpoint security space. For insight on selecting the right partner to
>> tackle endpoint security challenges, access the full report.
>> http://p.sf.net/sfu/symantec-dev2dev
>>
>>
>>
>> _______________________________________________
>> Matplotlib-users mailing list
>> Mat...@li...
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester
>> Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the
>> endpoint security space. For insight on selecting the right partner to
>> tackle endpoint security challenges, access the full report.
>> http://p.sf.net/sfu/symantec-dev2dev
>> _______________________________________________
>> Matplotlib-users mailing list
>> Mat...@li...
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>>
>
>

On Thu, Mar 7, 2013 at 5:32 PM, Brickle Macho <bri...@gm...> wrote:
> Thanks.   I had a quick read of the thread linked, if I was a
> stronger/better programmer I would see if I could contribute.
>
> For now I plan calculate/plot the angle between the normal and each the
> X,Y,Z planes.  I hopefully the 3 subplots will visually convey sufficient
> information.

Correct me if I'm wrong, but would a 2D quiver plot on top of a
contour plot work?  What spaces does the surface map to/from?  If your
surface can be expressed as a function f:R^2 -> R then it's equivalent
to look at its level sets, rather than the 3D picture.  You can then
project the surface normals onto the plane and plot them with a 2D
quiver plot.  If you want to keep the z-component information, then
you could colour the arrows according to the angle they make with the
x-y plane.

Does that make sense?

I put the original feature request in, and I think it would be useful,
but often I still find it easier to process two dimensional
information.

N.B.  The above will only work for *functions* f:R^2 -> R.  To
clarify, a sphere cannot be expressed this way, because the resulting
mapping would be multivalued.  Using this method, two distinct surface
normals may have the same colour.

Hope that makes sense.

Best wishes,
Damon

>
> Brickle.
> --
>
>
> On 8/03/13 5:43 AM, Benjamin Root wrote:
>
>
>
> On Thu, Mar 7, 2013 at 4:25 PM, Eric Firing <ef...@ha...> wrote:
>>
>> On 2013/03/07 9:19 AM, Benjamin Root wrote:
>> >
>> >
>> > On Thu, Mar 7, 2013 at 2:14 PM, Brickle Macho <bri...@gm...
>> > <mailto:bri...@gm...>> wrote:
>> >
>> >     I have a list of surface normals I would like to plot.  Is there a
>> > way
>> >     to plot a 3D vectors in matplotlib similar to how quiver plots 2D
>> >     vectors?
>> >
>> >
>> > Not at this time, but that would make a great feature request!  I think
>> > the current roadblock to such a function is a bug with converting 2d
>> > arrow objects into 3d arrows.
>>
>> Quiver uses a PolyCollection, and I see that there is a Poly3DCollection.
>>
>> Eric
>>
>> >
>> > Ben Root
>>
>>
>
> Took a bit of digging, but I knew I remembered this question before:
>
> http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CDMQFjAA&url=http%3A%2F%2Fmatplotlib.1069221.n5.nabble.com%2F2D-Quiver-in-Axes3D-td27944.html&ei=Pwk5UfGdLufv0QHuroD4BA&usg=AFQjCNEqlWv2vY5l2IPcje-g6B0U21wDNw&bvm=bv.43287494,d.dmQ
>
> And the feature request is here:
> https://github.com/matplotlib/matplotlib/issues/1026
>
> In the thread I pointed out a bug that I encountered.  I really hope I get
> some free time soon so that I can work on the various feature requests in
> mplot3d.
>
> Cheers!
> Ben Root
>
>
>
> ------------------------------------------------------------------------------
> Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester
> Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the
> endpoint security space. For insight on selecting the right partner to
> tackle endpoint security challenges, access the full report.
> http://p.sf.net/sfu/symantec-dev2dev
>
>
>
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>
>
> ------------------------------------------------------------------------------
> Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester
> Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the
> endpoint security space. For insight on selecting the right partner to
> tackle endpoint security challenges, access the full report.
> http://p.sf.net/sfu/symantec-dev2dev
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>



-- 
Damon McDougall
http://www.damon-is-a-geek.com
Institute for Computational Engineering Sciences
201 E. 24th St.
Stop C0200
The University of Texas at Austin
Austin, TX 78712-1229