Hi all,
I'm relatively new to matplotlib but have been generating some plots
without too much trouble over the last couple of weeks. Now I'm
getting trickier...
I have a timeseries plot that plots a few values against an x-axis of
dates. I *really* want to have my key line change color to red when
the values are *critical* but am having no success working with the
examples I can find. It appears that with dates as an x-axis,
something else needs to happen.
Here is the code:
# prep for multicolored line <-- here I simply generate the list of
required color values
r = colorConverter.to_rgba('r')
b = colorConverter.to_rgba('black')
color = list()
for f in daily_fvfm:
if f <= -0.4:
color.append(r)
else:
color.append(b)
# create the linecollection
points = zip(date_range, daily_fvfm)
segments = zip(points[:-1], points[1:])
lc = LineCollection(segments, colors = color) <--- here is where I
get the error at run-time (see below)
# create a figure with two subplots and add a
# second axis to the first figure
fig = mpl.figure(1)
fig.set_size_inches((10,5))
ax1 = fig.add_subplot(211)
ax2 = ax1.twinx()
ax3 = fig.add_subplot(212)
# plot the sst and then the par
ax1.plot(date_range[start_index:end_index],
daily_sst[start_index:end_index], 'b-')
ax1.plot(date_range[start_index:end_index],
daily_par[start_index:end_index], color='darkgoldenrod')
# then plot Fv/Fm
#ax2.plot(date_range[start_index:end_index],
daily_fvfm[start_index:end_index], lw='2', color='black')
ax2.add_collection(lc)
Traceback (most recent call last):
File "plot.py", line 87, in <module>
lc = LineCollection(segments, colors = color)
File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/site-packages/matplotlib/collections.py", line 926, in
__init__
self.set_segments(segments)
File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/site-packages/matplotlib/collections.py", line 938, in
set_segments
seg = np.asarray(seg, np.float_)
File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/site-packages/numpy/core/numeric.py", line 230, in asarray
return array(a, dtype, copy=False, order=order)
ValueError: setting an array element with a sequence.
Can a multicolor line be done with dates. if so, what is the
manipulation I need to do for dates?
Tim Burgess
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