matplotlib-users

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

[njs <nsc...@gm...>]

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? 

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')



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

[Eric F. <ef...@ha...>]

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
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>
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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.
> >
> > ------------------------------------------------------------
> ------------------
> > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
> > from Actuate! Instantly Supercharge Your Business Reports and Dashboards
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> iu=/4140/ostg.clktrk
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>
>
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Re: [Matplotlib-users] quiverkey() doesn't plot the reference vector?

[Eric F. <ef...@ha...>]

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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>      > from Actuate! Instantly Supercharge Your Business Reports and
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Re: [Matplotlib-users] quiverkey() doesn't plot the reference vector?

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

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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