quiverkey() doesn't plot the reference vector?

Community matplotlib-users
1

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 <efiring@…202…> 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 <efiring@…202… > > > mailto:efiring@...202...> 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.](http://matplotlib.1069221.n5.)__[nabble.com/file/n44968/qkey.__png](http://nabble.com/file/n44968/qkey.__png)

<[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.](http://matplotlib.1069221.n5.)__[nabble.com/file/n44968/qkey_1.__png](http://nabble.com/file/n44968/qkey_1.__png)

<[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.](http://matplotlib.1069221.n5.)__[nabble.com/quiverkey-doesn-t-__plot-the-reference-vector-__tp44968.html](http://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](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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