Re: [Matplotlib-users] quiverkey() doesn't plot the reference vector?

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This is probably related to the Agg renderer issue with edge-only markers.

On Wed Feb 18 2015 at 7:14:22 PM Eric Firing <ef...@ha...> wrote:

> On 2015/02/18 2:00 PM, Thomas Caswell wrote:
> > Is this just on master or with 1.4.x?
>
> It's on 1.4.1 and 1.4.2, but not on 1.4.3 or master or 1.4.0.  Therefore
> I won't enter it as an issue.
>
> I don't know what went wrong with this in those two bugfix releases.
>
> Eric
>
> >
> > On Wed Feb 18 2015 at 6:00:26 PM Eric Firing <ef...@ha...
> > <mailto:ef...@ha...>> wrote:
> >
> >     On 2015/02/18 9:52 AM, njs wrote:
> >      > Hi All,
> >      >
> >      > I'm having issues with quiver, and quiverkey() although, I have
> never
> >      > experienced these issues in the past.  I attached an image to
> >     this post that
> >      > demonstrates that quiver_key() used to work for me, this image
> >     was generated
> >      > on 17-Jul-2014.  However, if I run this exact same code (see
> >     below for the
> >      > code), the quiver key reference on the top right does not get
> >     plotted, but
> >      > the text will.  I haven't changed anything, but I think there
> >     have been some
> >      > package updates between then and now.  For what it's worth, I've
> >     tried many
> >      > different ways to generate the quiverkey() and haven't had any
> >     luck.  Has
> >      > anyone else experienced similar issues?
> >
> >     That's alarming!  I can reproduce the problem even with the standard
> mpl
> >     example--the arrow is missing in 5 out of the 6 plots.  I will file a
> >     github issue.  Thanks for the report.
> >
> >     Eric
> >
> >      >
> >      > Thanks for any insights!
> >      >
> >      > Working quiverkey():
> >      > <http://matplotlib.1069221.n5.__nabble.com/file/n44968/qkey.__png
> >     <http://matplotlib.1069221.n5.nabble.com/file/n44968/qkey.png>>
> >      >
> >      > quiverkey() doesn't work anymore...:
> >      >
> >     <http://matplotlib.1069221.n5.__nabble.com/file/n44968/qkey_1.__png
> >     <http://matplotlib.1069221.n5.nabble.com/file/n44968/qkey_1.png>>
> >      >
> >      > Code:
> >      >
> >      >          fig = plt.figure(figsize=(12,12))
> >      >          map = Basemap(projection = 'cyl', llcrnrlat = -30,
> >     urcrnrlat = 90, \
> >      >                      llcrnrlon = 0, urcrnrlon = 360, resolution =
> >     'c')
> >      >          [x,y] = N.meshgrid(lons,lats)
> >      >          [x,y] = map(x,y)
> >      >          [xulr,yulr] = N.meshgrid(lons1,lats1)
> >      >          [xulr,yulr] = map(xulr,yulr)
> >      >          clevs = N.arange(-50,51,5)
> >      >          cs = map.contourf(x,y,hgt500aComp[_
> _lag,:,:],cmap='RdBu_r',
> >      >                              levels = clevs)
> >      >          cs1 =
> >     map.contour(x,y,hgt500Comp[__lag,:,:],N.arange(1110,1230,6)__, \
> >      >
> >     colors='purple',linewidth=100,__linestyle = 'dashed')
> >      >          cs1 = map.contour(x,y,hgt500aComp[__lag,:,:],levels =
> clevs,
> >      >                          colors = 'black')
> >      >
> >      >
> >     colors=[(244,2,255),(36,26,__232),(255,255,255),(8,232,61),
> __(224,255,0)]
> >      >          cmap = mF.make_cmap(colors, position=None, bit=True)
> >      >          clevs = N.arange(-30,30.025,.025)
> >      >          cs2 = map.contourf(xulr,yulr,__
> olrComp[lag,:,:],cmap=cmap,
> >      >                      levels = clevs)
> >      >          Q =
> >     map.quiver(x[::2,::2],y[::2,::__2],u850Comp[lag,::2,::2],
> >      >              v850Comp[lag,::2,::2],width = 0.002,scale = 50)
> >      >          map.drawcoastlines(linewidth = 1)
> >      >          map.drawcountries(linewidth = 0.5)
> >      >          map.fillcontinents(zorder = 0)
> >      >          map.drawmeridians(N.arange(0,__360,30))
> >      >          map.drawparallels(N.arange(-__90,90,30))
> >      >          title = plt.title('Lag: {0} | Transition Cases | n =
> >      > {1}'.format(lag-30,len(cases))__)
> >      >          title.set_fontweight('bold')
> >      >          axt = fig.add_axes([.15,.35,.3,.01])
> >      >          cbar = plt.colorbar(cs,cax = axt,orientation =
> 'horizontal')
> >      >          cbar.set_label('500-hPa Anomaly (m)')
> >      >          cbar.set_ticks(N.arange(-50,__51,25))
> >      >          cs1.clabel(fmt = '%d')
> >      >          axt = fig.add_axes([.58,.35,.3,.01])
> >      >          cbar2 = plt.colorbar(cs2,cax = axt,orientation =
> >     'horizontal')
> >      >          cbar2.set_label(r'OLR Anomaly ($W m^{-2}$)')
> >      >          cbar2.set_ticks(N.arange(-30,__31,10))
> >      >          qk = plt.quiverkey(Q,0.95,1.05,1.0,__r'1 $m
> >     s^{-1}$',labelpos='E')
> >      >
> >      >
> >      >
> >      > --
> >      > View this message in context:
> >     http://matplotlib.1069221.n5.__nabble.com/quiverkey-doesn-t-
> __plot-the-reference-vector-__tp44968.html
> >     <http://matplotlib.1069221.n5.nabble.com/quiverkey-doesn-t-
> plot-the-reference-vector-tp44968.html>
> >      > Sent from the matplotlib - users mailing list archive at
> Nabble.com.
> >      >
> >      >
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