I'm having a similar problem to this, but that post didn't offer a minimal example. Does anyone have advice?
I sincerely hope the answer isn't "upgrade to matplotlib 3" as the iris package doesn't currently support that and iris is exceedingly useful for what I'm doing.
data.txt:
01-01-2019,00:00:03,334
01-01-2019,00:00:13,314
01-01-2019,00:00:23,295
01-01-2019,00:00:33,280
01-01-2019,00:00:43,310
01-01-2019,00:00:53,300
01-01-2019,00:01:03,310
Code:
import pandas as pd
import matplotlib.pyplot as plt
import matplotlib.dates as md
data = pd.read_csv(
"data.txt", infer_datetime_format=True,
dayfirst=True, parse_dates=[["date", "time"]],
index_col="date_time",
names=("date", "time", "wind")
)
ax = plt.axes()
data["wind"].plot(ax=ax)
plt.show()
ax = plt.axes()
data["wind"].plot(ax=ax)
ax.xaxis.set_major_formatter(md.DateFormatter('%Y'))
plt.show()
The first show statement gives this,
The second throws this beauty,
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
~/bin/conda3/envs/work/lib/python3.6/site-packages/IPython/core/formatters.py
in __call__(self, obj)
339 pass
340 else:
--> 341 return printer(obj)
342 # Finally look for special method names
343 method = get_real_method(obj, self.print_method)
~/bin/conda3/envs/work/lib/python3.6/site-packages/IPython/core/pylabtools.py
in <lambda>(fig)
242
243 if 'png' in formats:
--> 244 png_formatter.for_type(Figure, lambda fig: print_figure(fig, 'png', **kwargs))
245 if 'retina' in formats or 'png2x' in formats:
246 png_formatter.for_type(Figure, lambda fig: retina_figure(fig, **kwargs))
~/bin/conda3/envs/work/lib/python3.6/site-packages/IPython/core/pylabtools.py
in print_figure(fig, fmt, bbox_inches, **kwargs)
126
127 bytes_io = BytesIO()
--> 128 fig.canvas.print_figure(bytes_io, **kw)
129 data = bytes_io.getvalue()
130 if fmt == 'svg':
~/bin/conda3/envs/work/lib/python3.6/site-packages/matplotlib/backend_bases.py
in print_figure(self, filename, dpi, facecolor, edgecolor,
orientation, format, **kwargs) 2210
orientation=orientation, 2211 dryrun=True,
-> 2212 **kwargs) 2213 renderer = self.figure._cachedRenderer 2214 bbox_inches = self.figure.get_tightbbox(renderer)
~/bin/conda3/envs/work/lib/python3.6/site-packages/matplotlib/backends/backend_agg.py
in print_png(self, filename_or_obj, *args, **kwargs)
515
516 def print_png(self, filename_or_obj, *args, **kwargs):
--> 517 FigureCanvasAgg.draw(self)
518 renderer = self.get_renderer()
519 original_dpi = renderer.dpi
~/bin/conda3/envs/work/lib/python3.6/site-packages/matplotlib/backends/backend_agg.py
in draw(self)
435 # if toolbar:
436 # toolbar.set_cursor(cursors.WAIT)
--> 437 self.figure.draw(self.renderer)
438 # A GUI class may be need to update a window using this draw, so
439 # don't forget to call the superclass.
~/bin/conda3/envs/work/lib/python3.6/site-packages/matplotlib/artist.py
in draw_wrapper(artist, renderer, *args, **kwargs)
53 renderer.start_filter()
54
---> 55 return draw(artist, renderer, *args, **kwargs)
56 finally:
57 if artist.get_agg_filter() is not None:
~/bin/conda3/envs/work/lib/python3.6/site-packages/matplotlib/figure.py
in draw(self, renderer) 1491 1492
mimage._draw_list_compositing_images(
-> 1493 renderer, self, artists, self.suppressComposite) 1494 1495
renderer.close_group('figure')
~/bin/conda3/envs/work/lib/python3.6/site-packages/matplotlib/image.py
in _draw_list_compositing_images(renderer, parent, artists,
suppress_composite)
139 if not_composite or not has_images:
140 for a in artists:
--> 141 a.draw(renderer)
142 else:
143 # Composite any adjacent images together
~/bin/conda3/envs/work/lib/python3.6/site-packages/matplotlib/artist.py
in draw_wrapper(artist, renderer, *args, **kwargs)
53 renderer.start_filter()
54
---> 55 return draw(artist, renderer, *args, **kwargs)
56 finally:
57 if artist.get_agg_filter() is not None:
~/bin/conda3/envs/work/lib/python3.6/site-packages/matplotlib/axes/_base.py
in draw(self, renderer, inframe) 2633
renderer.stop_rasterizing() 2634
-> 2635 mimage._draw_list_compositing_images(renderer, self, artists) 2636 2637 renderer.close_group('axes')
~/bin/conda3/envs/work/lib/python3.6/site-packages/matplotlib/image.py
in _draw_list_compositing_images(renderer, parent, artists,
suppress_composite)
139 if not_composite or not has_images:
140 for a in artists:
--> 141 a.draw(renderer)
142 else:
143 # Composite any adjacent images together
~/bin/conda3/envs/work/lib/python3.6/site-packages/matplotlib/artist.py
in draw_wrapper(artist, renderer, *args, **kwargs)
53 renderer.start_filter()
54
---> 55 return draw(artist, renderer, *args, **kwargs)
56 finally:
57 if artist.get_agg_filter() is not None:
~/bin/conda3/envs/work/lib/python3.6/site-packages/matplotlib/axis.py in draw(self, renderer, *args, **kwargs) 1188
renderer.open_group(__name__) 1189
-> 1190 ticks_to_draw = self._update_ticks(renderer) 1191 ticklabelBoxes, ticklabelBoxes2 = self._get_tick_bboxes(ticks_to_draw,
1192
renderer)
~/bin/conda3/envs/work/lib/python3.6/site-packages/matplotlib/axis.py in _update_ticks(self, renderer) 1026 1027 interval =
self.get_view_interval()
-> 1028 tick_tups = list(self.iter_ticks()) # iter_ticks calls the locator 1029 if self._smart_bounds and tick_tups:
1030 # handle inverted limits
~/bin/conda3/envs/work/lib/python3.6/site-packages/matplotlib/axis.py in iter_ticks(self)
973 self.major.formatter.set_locs(majorLocs)
974 majorLabels = [self.major.formatter(val, i)
--> 975 for i, val in enumerate(majorLocs)]
976
977 minorLocs = self.minor.locator()
~/bin/conda3/envs/work/lib/python3.6/site-packages/matplotlib/axis.py in <listcomp>(.0)
973 self.major.formatter.set_locs(majorLocs)
974 majorLabels = [self.major.formatter(val, i)
--> 975 for i, val in enumerate(majorLocs)]
976
977 minorLocs = self.minor.locator()
~/bin/conda3/envs/work/lib/python3.6/site-packages/matplotlib/dates.py
in __call__(self, x, pos)
632 'you have not informed the axis that it is '
633 'plotting dates, e.g., with ax.xaxis_date()')
--> 634 dt = num2date(x, self.tz)
635 return self.strftime(dt, self.fmt)
636
~/bin/conda3/envs/work/lib/python3.6/site-packages/matplotlib/dates.py
in num2date(x, tz)
520 tz = _get_rc_timezone()
521 if not cbook.iterable(x):
--> 522 return _from_ordinalf(x, tz)
523 else:
524 x = np.asarray(x)
~/bin/conda3/envs/work/lib/python3.6/site-packages/matplotlib/dates.py
in _from_ordinalf(x, tz)
320 'non-datetime values are passed to an axis that '
321 'expects datetime objects.'.format(ix))
--> 322 dt = datetime.datetime.fromordinal(ix).replace(tzinfo=UTC)
323
324 # Since the input date `x` float is unable to preserve microsecond
ValueError: year 4233628 is out of range
