#10366: plotting dates requires a toordinal() call, which is inconvenient
---------------------------+------------------------------------------------
Reporter: jason | Owner: jason, was
Type: enhancement | Status: new
Priority: major | Milestone: sage-4.6.1
Component: graphics | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
---------------------------+------------------------------------------------
This doesn't work:
{{{
sage: version()
'Sage Version 4.6, Release Date: 2010-10-30'
sage: from matplotlib.dates import YearLocator, DateFormatter
sage: import datetime
sage:
sage: data=[
....: (datetime.date( 1995, 1, 1 ), 30),
....: (datetime.date( 1996, 3, 1 ), 50),
....: (datetime.date( 1997, 2, 4 ), 40),
....: ]
sage:
sage:
sage:
list_plot(data,ticks=[YearLocator(),None],tick_formatter=[DateFormatter('%Y-%m-%d'),None])
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/Users/grout/<ipython console> in <module>()
/Users/grout/sage/local/lib/python2.6/site-packages/sage/plot/misc.pyc in
wrapper(*args, **kwds)
136 options['__original_opts'] = kwds
137 options.update(kwds)
--> 138 return func(*args, **options)
139
140
/Users/grout/sage/local/lib/python2.6/site-packages/sage/plot/plot.pyc in
list_plot(data, plotjoined, **kwargs)
3523 P = line(data, **kwargs)
3524 else:
-> 3525 P = point(data, **kwargs)
3526 return P
3527
/Users/grout/sage/local/lib/python2.6/site-packages/sage/plot/point.pyc in
point(points, **kwds)
310 except (ValueError, TypeError):
311 from sage.plot.plot3d.shapes2 import point3d
--> 312 return point3d(points, **kwds)
313
314 @rename_keyword(color='rgbcolor', pointsize='size')
/Users/grout/sage/local/lib/python2.6/site-
packages/sage/plot/plot3d/shapes2.pyc in point3d(v, size, **kwds)
1009 return Point(v, size, **kwds)
1010 else:
-> 1011 A = sum([Point(z, size, **kwds) for z in v])
1012 A._set_extra_kwds(kwds)
1013 return A
/Users/grout/sage/local/lib/python2.6/site-
packages/sage/plot/plot3d/shapes2.pyc in __init__(self, center, size,
**kwds)
672 """
673 PrimitiveObject.__init__(self, **kwds)
--> 674 self.loc = (float(center[0]), float(center[1]),
float(center[2]))
675 self.size = size
676 self._set_extra_kwds(kwds)
TypeError: float() argument must be a string or a number
}}}
But inserting a toordinal() call for each date does work. It would be
really nice if Sage intelligently handled date data and did something like
this automatically.
{{{
sage: list_plot([(i.toordinal(), j) for i,j in
data],ticks=[YearLocator(),None],tick_formatter=[DateFormatter('%Y-%m-%d'),None])
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10366>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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