How do I plot box plots in pandas?

Question

I have a data frame that looks like this:

    Index (X1)  Index (X2)  Index (X3)
0   5.882343    9.564568    9.977265
1   5.669850    9.513452    9.581796
2   5.456141    9.280659    8.393673
3   3.874471    9.261816    8.313863
4   3.640098    7.667820    7.935063
5   3.559814    7.623439    6.713257
6   3.483627    7.584502    6.687415
7   3.319808    7.558787    6.101812
 ......

I want to make a 3 box plots on the same plot for these three columns. Moreover, the column lengths are not the same.

If I do this:

df.boxplot(by=['Index (X1)', 'Index (X2)', 'Index (X3)'])

I get this error:

TclError: no display name and no $DISPLAY environment variable

I tried the suggested code on this link, and it does not work for me. — Alex Trevylan, May 10 '18 at 14:44

sacuL · Accepted Answer · 2018-05-10T14:50:59.857

1

IIUC, simply df.boxplot() works. I'm assuming you mean that if your column lengths aren't the same, you have some NaN values in your columns.

If your df has more columns, but you only want those three columns, try:

df[['Index (X1)', 'Index (X2)', 'Index (X3)']].boxplot()
# or
df.boxplot(column=['Index (X1)', 'Index (X2)', 'Index (X3)'])

Both result in the following plot:

edited May 10 '18 at 14:50

answered May 10 '18 at 14:45

sacuL

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Thank you - but I am still getting the error – Alex Trevylan May 10 '18 at 14:57
Try *restarting python* and starting with `import matplotlib; matplotlib.use('Agg')` (as in the link) **before** you do anything else? – sacuL May 10 '18 at 15:02
1

Yes, did that :( – Alex Trevylan May 10 '18 at 15:09
Can you plot anything at all? Like, does `plt.plot([1,2,3])` work? – sacuL May 10 '18 at 15:12

How do I plot box plots in pandas?

1 Answers1