[Matplotlib-users] logarithmic chart (y axis) with dates along x axis?

[fafcb <fas...@gm...>]

I'm new to matplotlib, so maybe this is obvious, but I've search quite a bit
and can't find the answer.

I have a data set with several hundred rows and about 5 columns.  I want to
plot all data points (columns 2-5) on the same logarithmic chart with the x
axis showing calendar dates (column 1).

What is the best way to accomplish my task?  I have been experimenting with
semilogy, but I can't seem to figure out how to get columns 2-5 to plot by
date.  Just FYI, if it matters - the data is currently held in a csv file
and each column may or may not have a data point for each date.

Thanks in advance for any help!