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

[Thomas C. <tca...@gm...>]

Is this just on master or with 1.4.x?

On Wed Feb 18 2015 at 6:00:26 PM Eric Firing <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>
> >
> > quiverkey() doesn't work anymore...:
> > <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
> > Sent from the matplotlib - users mailing list archive at Nabble.com.
> >
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