CODEWITHSUNDEEP
pythonpandasmatplotlib
noob
noob

Reputation: 6864

How to fill between the lines in a pandas/matplotlib time series plot

I have a data frame which is indexed by DataTime in pandas.

I have data about a car with the Inside temperature, Lowest inside temperature, Highest temperature and the same three features for the Outside temperature.

Thus I plot all 6 features like so as a time series, and have tried to use plt.fill_between like so :

car_df[['insideTemp','insideTempLow','insideTempHigh','outsideTemp','outsideTempLow','outsideTempHigh']].plot()
plt.fill_between(car_df['insideTemp'], car_df['insideTempLow'],car_df['insideTempHigh'], data=car_df)
plt.fill_between(car_df['outsideTemp'], car_df['outsideTempLow'],car_df['outsideTempHigh'], data=car_df)
plt.show()

I get 6 lines as desired, however nothing seems to get filled (thus not separating the two categories of indoor and outdoor).

Any ideas? Thanks in advance.

Upvotes: 0

Views: 2763

Answers (1)

Valdi_Bo
Valdi_Bo

Reputation: 30991

You passed wrong arguments to fill_between.

The proper parameters are as follows:

  • x - x coordinates, in your case index values,
  • y1 - y coordinates of the first curve,
  • y2 - y coordinates of the secondt curve.

For readability, usually there is a need to pass also color parameter.

I performed such a test to draw just 2 lines (shortening column names) and fill the space between them:

car_df[['inside', 'outside']].plot()
plt.fill_between(car_df.index, car_df.inside, car_df.outside,
    color=(0.8, 0.9, 0.5));

and got the followig picture:

enter image description here

Upvotes: 1

Related Questions