Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
421 views
in Technique[技术] by (71.8m points)

python - Plot with non-numerical data on x axis (for ex., dates)

I'd like to plot numerical data against non numerical data, say something like this:

import matplotlib.pyplot as pl
x=['a','b','c','d']
y=[1,2,3,4]
pl.plot(x,y)

However, with matplotlib plot packages you get a warning that the data is not float (ValueError: invalid literal for float(): a).

In their 'How-to', they suggest to put first the numerical data on the x axis and then format it. Is there a way to do it directly (as above)?

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

Use the xticks function.

import matplotlib.pyplot as pl
xticks=['a','b','c','d']
x=[1,2,3,4]
y=[1,2,3,4]
pl.plot(x,y)
pl.xticks(x,xticks)
pl.show()

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...