Hi Xavier (cc list), It may be a bug, however I do not know what the default behaviour 'should' be. You could do:
lims = [-4, 4, -4, 4] axis(lims) after calling quiver to see the whole arrow. I did notice that calling axis('tight') threw the following error /Users/Damon/python/lib/matplotlib/axes.py:2038: UserWarning: Attempting to set identical xmin==xmax results in singular transformations; automatically expanding. xmin=1.0, xmax=1.0 warnings.warn('Attempting to set identical xmin==xmax results in singular transformations; automatically expanding. xmin=%s, xmax=%s'%(xmin, xmax)) /Users/Damon/python/lib/matplotlib/axes.py:2212: UserWarning: Attempting to set identical ymin==ymax results in singular transformations; automatically expanding. ymin=1.0, ymax=1.0 warnings.warn('Attempting to set identical ymin==ymax results in singular transformations; automatically expanding. ymin=%s, ymax=%s'%(ymin, ymax)) is this correct, or is it a bug? I'm using "ipython -pylab" with the MacOSX backend. I was expecting axis('tight') would scale the axes so I could see the whole arrow. Regards, -- Damon -------------------------- Damon McDougall Mathematics Institute University of Warwick Coventry CV4 7AL d.mcdoug...@warwick.ac.uk On 22 Nov 2009, at 21:34, Xavier Gnata wrote: > Hi, > > RTFM...indeed it works. > However, the axis do not scale accordingly: > > quiver([1],[1],[2],[2], angles='xy', scale_units='xy', scale=1) on a TkAgg > backend produce a plot with: > In [11]: axis() > Out[11]: > (0.94000000000000006, > 1.0600000000000001, > 0.94000000000000006, > 1.0600000000000001) > > The display area scales the same way as it does using quiver([1],[1],[2],[2]) > (without any other args). > It looks like a bug. > > Xavier > > >> Hi Xavier, >> >> You can pass some handy keyword arguments to fix that. Use the following: >> >> quiver([1],[1],[1.2],[1.2], angles='xy', scale_units='xy', scale=1) >> >> Hope that helps :) >> >> >> Regards, >> -- Damon >> >> -------------------------- >> Damon McDougall >> Mathematics Institute >> University of Warwick >> Coventry >> CV4 7AL >> d.mcdoug...@warwick.ac.uk >> >> On 22 Nov 2009, at 16:37, Xavier Gnata wrote: >> >> >>> Hi, >>> >>> I woud like to draw a vector field using pylab. >>> quivert looks nice but it sould not scale the arrows to fit my use-case. >>> quiver([1],[1],[1.2],[1.2]) does plot a nice arrow but the head of the >>> arrow is not at (1.2,1.2). >>> Is there a way to plot a list of arrows *without* any scaling? >>> >>> Xavier >>> >>> ------------------------------------------------------------------------------ >>> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day >>> trial. Simplify your report design, integration and deployment - and focus >>> on >>> what you do best, core application coding. Discover what's new with >>> Crystal Reports now. http://p.sf.net/sfu/bobj-july >>> _______________________________________________ >>> Matplotlib-users mailing list >>> Matplotlib-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users >>> >> > ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users