Hi Paul,
> The reason you were getting that error is because unless you
> specify otherwise, ax.bar will make the bottom of the bars at 0 -
> which isn't an allowed date, hence the error. Change your bar
> line to this (I also added align='center', but you can remove it
> if you want):
Aha, OK that makes sense. Thank you. I think the point #3 in my
previous email about the "Ordinal must be >= 1" has all been about
what is or isn't allowed as a proper date.
So your example worked of course, but I am still not able to get my
real code to plot a bar chart. If I tell you what the format of the
data is, maybe you can help me.
I would like to plot dates (on x axis) versus time intervals (on y).
I have a list of dates and I have a two lists (self.data[0] and
self.data[1]), one of the start times ("bots") and one of the stop
times ("tops"). But when I go to plot it, and do this (based on your
code...for now leaving out the round() step):
bots = self.data[0]
tops = self.data[1]
bars = self.subplot.bar(self.final_dates, top-bot, bottom=bot, align='center')
I get the error:
TypeError: unsupported operand type(s) for -: 'list' and 'list'
Because I am trying to subtract the "bots" list from the "tops" list.
In the example code I gave, bot and times were not lists but were a
'numpy.ndarray' and a numpy.float64' object, respectfully, and I guess
the - operand can be used on them.
How can I structure my data such that this can work? (For some reason
I have not had nearly this much confusion with plotting lines, just
bars).
Thanks for all the help,
Che (CM)
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