matplotlib-users Mailing List for matplotlib (Page 108)

Thanks for these tips. It looks like some programs (like illustrator, and
pdf2ps) are semi-smart about handling transparency when converting to ps.
Both have their quirks (illustrator seems to mess up the bounding box,
pdf2ps makes the text look worse/fuzzy).

Is this the recommended/best strategy?

Thanks,
chris


On Thu, Aug 22, 2013 at 8:04 PM, Jerzy Karczmarczuk <
jer...@un...> wrote:

> Chris Beaumont :
> >
> > I have a semitransparent plot that I rather like:
> ...
> > I'd like to publish something like this in a journal which requires
> > EPS figures. Unfortunately, EPS doesn't support transparency.
> >
> > How hard would it be to coax matplotlib (or another tool) to convert
> > this semi-transparent figure into a non-semitransparent figure that
> > looks the same?
>
> I won't claim that this is an ultimate solution, but what I did a few
> times was to
> 1. Choose the svg backend, savefig the picture as svg.
> 2. Open in Inkscape and export as .eps.
>
> The result was satisfactory.
>
> Jerzy Karczmarczuk
>
>
>
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Chris Beaumont :
>
> I have a semitransparent plot that I rather like:
...
> I'd like to publish something like this in a journal which requires 
> EPS figures. Unfortunately, EPS doesn't support transparency.
>
> How hard would it be to coax matplotlib (or another tool) to convert 
> this semi-transparent figure into a non-semitransparent figure that 
> looks the same?

I won't claim that this is an ultimate solution, but what I did a few 
times was to
1. Choose the svg backend, savefig the picture as svg.
2. Open in Inkscape and export as .eps.

The result was satisfactory.

Jerzy Karczmarczuk

Hi,

I have a semitransparent plot that I rather like:

[image: Inline image 1]
I'd like to publish something like this in a journal which requires EPS
figures. Unfortunately, EPS doesn't support transparency.

How hard would it be to coax matplotlib (or another tool) to convert this
semi-transparent figure into a non-semitransparent figure that looks the
same? It would consist of more polygons, each of which has a constant RGB
value in the transparent figure.

I don't want to rasterize the lines, because I like zooming absurdly far
into plots, and having them stay crisp.

Cheers,
Chris

That is handy information.  I'll start adding a python.org target.

How broad coverage do we want?
10.6, 10.7, 10.8
system, python.org (2.7, 3.3), brew, macports
virtualenv, no virtualenv
with/without third party X

The testing matrix blows up pretty quickly.  For those of you with longer
memories, where are the corners where things tend to break?

-matt



On Tue, Aug 20, 2013 at 12:09 PM, Russell E. Owen <ro...@uw...> wrote:

> A few hints:
>
> If you just want to build matplotlib for your own computer (and don't
> care about making an installer that will work on anybody else's) then
> you can install from source with very little trouble:
> - You may want to edit setupext.py to limit searching to those dirs that
> really matter, but this is only needed if you have installed extras that
> might conflict.
> - You may want to edit setup.cfg to select a better default back end.
>
> You have to be much more careful if you want to build a binary installer
> that can be used by others. I've found that bdist_mpkg works, and I've
> found it is safest to build on the oldest platform I want the installer
> to support (for example /usr/X11/lib moved in 10.8 or 10.7 in a way that
> is forward but not backwards compatible).
>
> For Apple's python you need install anything; all you need is in
> /usr/lib and /usr/X11/lib. I have no idea if TkAgg works well.
>
> For python.org python you should install a version of Tcl/Tk. I suggest
> ActiveState Tcl/Tk 8.5.11. Be warned that versions 8.5.12, 8.5.12.1,
> 8.5.13 all have known crashing problems; I have not tried 8.5.14 (which
> came out fairly recently) as 8.5.11 seems to do well enough.
>
> I've cannot comment on building matplotlib for macports, fink or
> homebrew.
>
> -- Russell
>
> In article <520...@st...>,
>  Michael Droettboom <md...@st...>
>  wrote:
>
> > We actually discussed this very issue yesterday in our Google hangout
> > about continuous integration. We're probably going to need to script a
> > full setup from a clean Mac + XCode to a working matplotlib development
> > environment in order to make that happen, and obviously that will be
> > shared with the world.  Things are even more complex on Windows, and I'd
> > like to do that there, too.  So stay tuned.
> >
> > Mike
> >
> > On 08/16/2013 10:02 AM, Paul Hobson wrote:
> > > Mike,
> > >
> > > That's great news. Is there any chance we can look forward to
> > > "official" instructions for setting up a Mac to develop matplotlib?
> > >
> > > I gave up a long time ago and started piecing to together my meager
> > > PRs in a linux VM.
> > > -paul
> > >
> > >
> > > On Fri, Aug 16, 2013 at 6:52 AM, Michael Droettboom
> > > <md...@st...
> > > <mailto:md...@st...>> wrote:
> > >
> > >     Thanks to the gracious donation from Hans Petter Langtangen and the
> > >     Center for Biomedical Computing at Simula
> > >     (http://home.simula.no/~hpl <http://home.simula.no/%7Ehpl>),
> > >     I now have a new Mac Mini sitting at my desk.  This should allow
> me to
> > >     keep on top of changes that affect the Mac builds and to better
> track
> > >     down Mac-only issues.
> > >
> > >     Stay tuned over the next few weeks and months as we will most
> > >     likely be
> > >     using some more of these funds to pay for hosted continuous
> > >     integration
> > >     services (as discussed yesterday in our MEP19 Google Hangout).
> > >
> > >     Cheers,
> > >     Mike
>
>
>
> ------------------------------------------------------------------------------
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Hi matplotlib users:

Could you please help me with this?

I have created a map plot and a colorbar. For the colorbar I've used the
format argument, supplying the following object as a value:

#format the colorbar tick labels
sfmt = ScalarFormatter(useMathText=True)
sfmt.set_powerlimits((-2, 2))

cb = colorbar(format=sfmt)

As you can see on the image below my text from the multiplier is
overlapping with a top tick label. I would like to lift it a bit, is there
an easy way?
I tried this, but it does not work, since after colorbar() the toffsetText does
not contain the multiplier yet:

ax = cb.ax
title = ax.offsetText.get_text()
ax.offsetText.set_text("{0}\n\n\n\n".format(title))

[image: image]<https://f.cloud.github.com/assets/900941/986867/2a1ef2c8-08e1-11e3-9674-12ac7558f082.png>

I could, probably increase the width of the colorbar or decrease font
size... But I like this width and the font size seems to be very readable.

Perhaps hexbin() is what you are looking for?

Cheers!
Ben Root
 On Aug 19, 2013 7:29 PM, "dilpreet singh" <gig...@gm...> wrote:

> Hi
>
> i want to plot a scatter plot similar to the one attached with email . I
> can plot a histogram but the hist method can't plot a scatter plot . Is
> there a way to use the output of the hist() method and use it as an input
> to the scatter plot ?
>
> The part of the code i am using to plot histogram is as follows :
>
>     data = get_data()
>     plt.figure(figsize=(7,4))
>     ax = plt.subplots()
>     plt.hist(data,histtype='bar',bins = 100,log=True)
>     plt.show()
>
> Thanks
> Dilpreet
>
>
>
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>

Dilpreet,

Fortunately, you have a couple of options here. First of all, when you call
the plt.hist function, it actually returns three useful sets of data: the
frequencies, bin edges, and the bar patches. The first two are probably
what you want. You can grab those for later use in your code by doing the
following:

freq, bins, bars = plt.hist(data,histtype='bar',bins = 100,log=True)

It will be a little tricky here because the 'bins' array are the edges of
the bins that contain the frequency values, so there will be one more value
than the 'freq' array. You can quickly calculate the center of the bins by
taking the average of each bin pair:

(bins[1:] + bins[:-1])/2.

Alternatively, if you don't want to actually plot the histogram but just
the freq and bins arrays, then you can use the 'histogram' function in
Numpy, which I believe is used internally by Matplotlib.
http://docs.scipy.org/doc/numpy/reference/generated/numpy.histogram.html

Ryan


On Mon, Aug 19, 2013 at 7:27 PM, dilpreet singh <gig...@gm...> wrote:

> Hi
>
> i want to plot a scatter plot similar to the one attached with email . I
> can plot a histogram but the hist method can't plot a scatter plot . Is
> there a way to use the output of the hist() method and use it as an input
> to the scatter plot ?
>
> The part of the code i am using to plot histogram is as follows :
>
>     data = get_data()
>     plt.figure(figsize=(7,4))
>     ax = plt.subplots()
>     plt.hist(data,histtype='bar',bins = 100,log=True)
>     plt.show()
>
> Thanks
> Dilpreet
>
>
>
> ------------------------------------------------------------------------------
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> AppDynamics. Performance Central is your source for news, insights,
> analysis and resources for efficient Application Performance Management.
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> _______________________________________________
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> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>

Hi

i want to plot a scatter plot similar to the one attached with email . I
can plot a histogram but the hist method can't plot a scatter plot . Is
there a way to use the output of the hist() method and use it as an input
to the scatter plot ?

The part of the code i am using to plot histogram is as follows :

    data = get_data()
    plt.figure(figsize=(7,4))
    ax = plt.subplots()
    plt.hist(data,histtype='bar',bins = 100,log=True)
    plt.show()

Thanks
Dilpreet

> From: Vlastimil Brom [mailto:vla...@gm...] 
> 
> to reuse the matplotlib controls or just the plotting area, check the
> examples on embedding in the demo pages:
> http://matplotlib.org/examples/user_interfaces/embedding_in_gtk.html
> or the others in the respective section:
> http://matplotlib.org/examples/user_interfaces/index.html
> (I don't use gtk myself, but I believe, it might be directly usable in
> your code.)

That's just the ticket. Thanks.

-- 

Ciao,               Paul D. DeRocco
Paul                mailto:pde...@ix... 

I'm not much of a matplotlib user, and started poking around for
"GtkSocket matplotlib".  I'm not sure that's the right direction,
however, it eventually led me to this blog post which only exists now
in the Wayback Machine:

http://web.archive.org/web/20111005011905/http://www.serpia.org/blog/2007/nov/03/matplotlib-and-pygtk-app/

In it (a complete Gtk+matplotlib tutorial) he uses FigureCanvasGTK to
place the plot in the PyGtk app.

Skip

2013/8/19 Paul D. DeRocco <pde...@ix...>:
> I've just tried Matplotlib for the first time, for plotting on the screen,
> and the examples all seem to pop up a new window with interactive tools,
> like Matlab does. That's very nice, but what I need is to create a static
> plot that appears in some sort of widget in an existing window created
> with PyGTK, without any of the controls. Is there a page that shows how
> this can be done? Is it even possible?
>
> --
>
> Ciao,               Paul D. DeRocco
> Paul                mailto:pde...@ix...
>
Hi,
to reuse the matplotlib controls or just the plotting area, check the
examples on embedding in the demo pages:
http://matplotlib.org/examples/user_interfaces/embedding_in_gtk.html
or the others in the respective section:
http://matplotlib.org/examples/user_interfaces/index.html
(I don't use gtk myself, but I believe, it might be directly usable in
your code.)

hth,
  vbr

> From: Sudheer Joseph [mailto:sud...@ya...] 
> 
>             If you start python like below with qt console. 
> You will get plots with out controls etc. You can right click 
> on plots and save it as png. Else from command prompt as pdf 
> as you wish.
> 
> ipython qtconsole  --colors=linux  --pylab=inline

That's not what I meant. I'm not using ipython or qtconsole. This is for
an embedded system (Gumstix) with a small LCD. I have a program written in
PyGTK that fills the LCD with a single window with various buttons in it.
I want to display a plot in a pane in that window, not in a separate
window.

-- 

Ciao,               Paul D. DeRocco
Paul                mailto:pde...@ix... 

Hi Paul,
            If you start python like below with qt console. You will get plots with out controls etc. You can right click on plots and save it as png. Else from command prompt as pdf as you wish.


ipython qtconsole  --colors=linux  --pylab=inline

 




>________________________________
> From: Paul D. DeRocco <pde...@ix...>
>To: Matplotlib list <mat...@li...> 
>Sent: Monday, 19 August 2013 1:17 PM
>Subject: [Matplotlib-users] Graphing in an existing PyGTK window
> 
>
>I've just tried Matplotlib for the first time, for plotting on the screen,
>and the examples all seem to pop up a new window with interactive tools,
>like Matlab does. That's very nice, but what I need is to create a static
>plot that appears in some sort of widget in an existing window created
>with PyGTK, without any of the controls. Is there a page that shows how
>this can be done? Is it even possible?
>
>-- 
>
>Ciao,               Paul D. DeRocco
>Paul                mailto:pde...@ix... 
>
>
>
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>
>
>

I've just tried Matplotlib for the first time, for plotting on the screen,
and the examples all seem to pop up a new window with interactive tools,
like Matlab does. That's very nice, but what I need is to create a static
plot that appears in some sort of widget in an existing window created
with PyGTK, without any of the controls. Is there a page that shows how
this can be done? Is it even possible?

-- 

Ciao,               Paul D. DeRocco
Paul                mailto:pde...@ix... 
 

I've been in touch with the Travis-CI guys about this a little bit.  
They restrict each project to a single OS partly to reduce resource 
consumption, but they said they might reconsider for paying customers 
(which we may want to become).

Mike

On 08/16/2013 04:17 PM, Matt Terry wrote:
>
> I was looking into the TravisCI Mac testing environment. Right now, 
> you can only run tests on a single os. You also trigger a Mac build by 
> declaring your language to be objective-c. There are probably more q 
> quirks, but that's what I've found thus far.
>
> -matt
>
> On Aug 16, 2013 12:45 PM, "Matthew Brett" <mat...@gm... 
> <mailto:mat...@gm...>> wrote:
>
>     Hi,
>
>     On Fri, Aug 16, 2013 at 10:36 AM, Kevin Hunter Kesling
>     <kmh...@nc... <mailto:kmh...@nc...>> wrote:
>     > At 12:11pm -0400 Fri, 16 Aug 2013, Matthew Brett wrote:
>     >>
>     >> We've got 5 macs running OSX 10.4 through 10.8 for us, you'd be
>     >> welcome to remote access to those, and we'd be happy to run builds
>     >> for you. Paul Ivanov has or will have access to the buildbot master
>     >> and all the slaves. We also have an XP and Windows 7 64 bit machine
>     >> you are welcome to use.
>     >
>     >
>     > Bless you for supporting OS X prior to 10.6!  My family still
>     has a quite
>     > functional OS X 10.5 machine that we should update but can't for
>     various
>     > (less than stellar, but unfortunately real) reasons.  I'm
>     chagrined that
>     > Apple et al. no longer supports 10.5.  I'm sure others feel
>     similarly about
>     > their 10.4- machines.
>     >
>     > On the other hand, no one would blame a development team that
>     decided not to
>     > support what even Apple does not support.
>
>     :) - we just happened to have them lying around.  Actually, the 10.5
>     machine is PPC and catches endian errors fairly often, but I'm sure
>     we'll retire the 10.4 machine fairly soon.
>
>     Cheers,
>
>     Matthew
>
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>
>
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I was looking into the TravisCI Mac testing environment. Right now, you can
only run tests on a single os. You also trigger a Mac build by declaring
your language to be objective-c. There are probably more q quirks, but
that's what I've found thus far.

-matt
On Aug 16, 2013 12:45 PM, "Matthew Brett" <mat...@gm...> wrote:

> Hi,
>
> On Fri, Aug 16, 2013 at 10:36 AM, Kevin Hunter Kesling
> <kmh...@nc...> wrote:
> > At 12:11pm -0400 Fri, 16 Aug 2013, Matthew Brett wrote:
> >>
> >> We've got 5 macs running OSX 10.4 through 10.8 for us, you'd be
> >> welcome to remote access to those, and we'd be happy to run builds
> >> for you. Paul Ivanov has or will have access to the buildbot master
> >> and all the slaves. We also have an XP and Windows 7 64 bit machine
> >> you are welcome to use.
> >
> >
> > Bless you for supporting OS X prior to 10.6!  My family still has a quite
> > functional OS X 10.5 machine that we should update but can't for various
> > (less than stellar, but unfortunately real) reasons.  I'm chagrined that
> > Apple et al. no longer supports 10.5.  I'm sure others feel similarly
> about
> > their 10.4- machines.
> >
> > On the other hand, no one would blame a development team that decided
> not to
> > support what even Apple does not support.
>
> :) - we just happened to have them lying around.  Actually, the 10.5
> machine is PPC and catches endian errors fairly often, but I'm sure
> we'll retire the 10.4 machine fairly soon.
>
> Cheers,
>
> Matthew
>
>
> ------------------------------------------------------------------------------
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> It's a free troubleshooting tool designed for production.
> Get down to code-level detail for bottlenecks, with <2% overhead.
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>

Hi,

On Fri, Aug 16, 2013 at 10:36 AM, Kevin Hunter Kesling
<kmh...@nc...> wrote:
> At 12:11pm -0400 Fri, 16 Aug 2013, Matthew Brett wrote:
>>
>> We've got 5 macs running OSX 10.4 through 10.8 for us, you'd be
>> welcome to remote access to those, and we'd be happy to run builds
>> for you. Paul Ivanov has or will have access to the buildbot master
>> and all the slaves. We also have an XP and Windows 7 64 bit machine
>> you are welcome to use.
>
>
> Bless you for supporting OS X prior to 10.6!  My family still has a quite
> functional OS X 10.5 machine that we should update but can't for various
> (less than stellar, but unfortunately real) reasons.  I'm chagrined that
> Apple et al. no longer supports 10.5.  I'm sure others feel similarly about
> their 10.4- machines.
>
> On the other hand, no one would blame a development team that decided not to
> support what even Apple does not support.

:) - we just happened to have them lying around.  Actually, the 10.5
machine is PPC and catches endian errors fairly often, but I'm sure
we'll retire the 10.4 machine fairly soon.

Cheers,

Matthew

At 12:11pm -0400 Fri, 16 Aug 2013, Matthew Brett wrote:
> We've got 5 macs running OSX 10.4 through 10.8 for us, you'd be
> welcome to remote access to those, and we'd be happy to run builds
> for you. Paul Ivanov has or will have access to the buildbot master
> and all the slaves. We also have an XP and Windows 7 64 bit machine
> you are welcome to use.

Bless you for supporting OS X prior to 10.6!  My family still has a 
quite functional OS X 10.5 machine that we should update but can't for 
various (less than stellar, but unfortunately real) reasons.  I'm 
chagrined that Apple et al. no longer supports 10.5.  I'm sure others 
feel similarly about their 10.4- machines.

On the other hand, no one would blame a development team that decided 
not to support what even Apple does not support.

Cheers,

Kevin

Hi,

On Fri, Aug 16, 2013 at 7:32 AM, Michael Droettboom <md...@st...> wrote:
> We actually discussed this very issue yesterday in our Google hangout about
> continuous integration.  We're probably going to need to script a full setup
> from a clean Mac + XCode to a working matplotlib development environment in
> order to make that happen, and obviously that will be shared with the world.
> Things are even more complex on Windows, and I'd like to do that there, too.
> So stay tuned.

We've got 5 macs running builds on OSX 10.4 through 10.8 for us, you'd be
welcome to remote access to those, and we'd be happy to run builds for
you.  Paul Ivanov has or will have access to the buildbot master and
all the slaves. We also have an XP and Windows 7 64 bit machine you
are welcome to use.

Cheers,

Matthew

Hi,

On Fri, Aug 16, 2013 at 7:32 AM, Michael Droettboom <md...@st...> wrote:
> We actually discussed this very issue yesterday in our Google hangout about
> continuous integration.  We're probably going to need to script a full setup
> from a clean Mac + XCode to a working matplotlib development environment in
> order to make that happen, and obviously that will be shared with the world.
> Things are even more complex on Windows, and I'd like to do that there, too.
> So stay tuned.

We've got 5 macs running OSX 10.4 through 10.8 for us, you'd be
welcome to remote access to those, and we'd be happy to run builds for
you.  Paul Ivanov has or will have access to the buildbot master and
all the slaves. We also have an XP and Windows 7 64 bit machine you
are welcome to use.

Cheers,

Matthew

We actually discussed this very issue yesterday in our Google hangout 
about continuous integration. We're probably going to need to script a 
full setup from a clean Mac + XCode to a working matplotlib development 
environment in order to make that happen, and obviously that will be 
shared with the world.  Things are even more complex on Windows, and I'd 
like to do that there, too.  So stay tuned.

Mike

On 08/16/2013 10:02 AM, Paul Hobson wrote:
> Mike,
>
> That's great news. Is there any chance we can look forward to 
> "official" instructions for setting up a Mac to develop matplotlib?
>
> I gave up a long time ago and started piecing to together my meager 
> PRs in a linux VM.
> -paul
>
>
> On Fri, Aug 16, 2013 at 6:52 AM, Michael Droettboom <md...@st... 
> <mailto:md...@st...>> wrote:
>
>     Thanks to the gracious donation from Hans Petter Langtangen and the
>     Center for Biomedical Computing at Simula
>     (http://home.simula.no/~hpl <http://home.simula.no/%7Ehpl>),
>     I now have a new Mac Mini sitting at my desk.  This should allow me to
>     keep on top of changes that affect the Mac builds and to better track
>     down Mac-only issues.
>
>     Stay tuned over the next few weeks and months as we will most
>     likely be
>     using some more of these funds to pay for hosted continuous
>     integration
>     services (as discussed yesterday in our MEP19 Google Hangout).
>
>     Cheers,
>     Mike
>
>
>
>     ------------------------------------------------------------------------------
>     Get 100% visibility into Java/.NET code with AppDynamics Lite!
>     It's a free troubleshooting tool designed for production.
>     Get down to code-level detail for bottlenecks, with <2% overhead.
>     Download for free and get started troubleshooting in minutes.
>     http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk
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>     Mat...@li...
>     <mailto:Mat...@li...>
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>
>

Mike,

That's great news. Is there any chance we can look forward to "official"
instructions for setting up a Mac to develop matplotlib?

I gave up a long time ago and started piecing to together my meager PRs in
a linux VM.
-paul


On Fri, Aug 16, 2013 at 6:52 AM, Michael Droettboom <md...@st...> wrote:

> Thanks to the gracious donation from Hans Petter Langtangen and the
> Center for Biomedical Computing at Simula (http://home.simula.no/~hpl),
> I now have a new Mac Mini sitting at my desk.  This should allow me to
> keep on top of changes that affect the Mac builds and to better track
> down Mac-only issues.
>
> Stay tuned over the next few weeks and months as we will most likely be
> using some more of these funds to pay for hosted continuous integration
> services (as discussed yesterday in our MEP19 Google Hangout).
>
> Cheers,
> Mike
>
>
>
>
> ------------------------------------------------------------------------------
> Get 100% visibility into Java/.NET code with AppDynamics Lite!
> It's a free troubleshooting tool designed for production.
> Get down to code-level detail for bottlenecks, with <2% overhead.
> Download for free and get started troubleshooting in minutes.
> http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk
> _______________________________________________
> Matplotlib-devel mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
>

Thanks to the gracious donation from Hans Petter Langtangen and the 
Center for Biomedical Computing at Simula (http://home.simula.no/~hpl), 
I now have a new Mac Mini sitting at my desk.  This should allow me to 
keep on top of changes that affect the Mac builds and to better track 
down Mac-only issues.

Stay tuned over the next few weeks and months as we will most likely be 
using some more of these funds to pay for hosted continuous integration 
services (as discussed yesterday in our MEP19 Google Hangout).

Cheers,
Mike

On Thu, Aug 15, 2013 at 09:06:02PM +0200, vwf wrote:
[...]
> On stackoverflow I found:
> widths = np.linspace(0, 2, X.size)
> plt.quiver(X, Y, cos(deg), sin(deg), linewidths=widths)
[...]

I kind of found out how it works. quiver has width and linewidth.
width takes a scalar, linewidth can take a vector. 
width sets the width of the shaft, linewidth sets the width of the edge...

How it works precisely I do not know yet, but this works for me:

plt.quiver(x_vector,y_vector,u_vector,v_vector,
   linewidth=w_vector, width=0.001, headwidth=3,
   color=mycolor, edgecolors=mycolor)

Cheers

On Aug 15, 2013 3:07 PM, "vwf" <vw...@vu...> wrote:
>
> After some struggling I got my first plots with quiver working.
> A simple plot is very simple, but a complicated one is very different.
> Right now I have a 80x80 grid with multiple plots and I plan to go up.
> For this I need full control of the arrow dimensions.
>
> The only way I can get narrow arrow is by setting width:
> plt.quiver(x,y,u,v, width=0.001, headwidth=3, scale=0.07,...
> works fine for me. But I would like to set the linewidth per arrow.
>
> On stackoverflow I found:
> widths = np.linspace(0, 2, X.size)
> plt.quiver(X, Y, cos(deg), sin(deg), linewidths=widths)
>
> This did not work for me: the minimum width was too large.
> I there a way to create narrow arrows with varying width?
>

The point of the example was to show that one can assign an array of widths
to a quiver plot. The array can have whatever values you want. Note that
there is likely a subtle difference between "width" and "linewidth" as
keyword arguments that you might want to experiment with.

Cheers!
Ben Root