如何在python中创建堆叠线图？

Question

I have fluorescence values over a period of 200 time steps for 300 individual cells. I want to plot them all on the same figure stacked one on top of another. I don't want to plot a stacked area plot. The image below is what I'm looking for, but essentially it's each cell's data plotted on its own individual y-axis, with all cells having the same x-axis.

Answer 1

The main plotting tools (that work with pandas) in python are matplotlib (older) and seaborn (newer and a littler fancier).

Looking at seaborn's docs ( https://seaborn.pydata.org/tutorial/axis_grids.html ) and a recipe page ( https://python-graph-gallery.com/122-multiple-lines-chart/ ) for multi-component composite plots, you can show your fluorescence data like this:

# libraries
import matplotlib.pyplot as plt
import numpy as np
import pandas as pd

# Data
df=pd.DataFrame({'x': range(100), 
                 'trace1': np.random.randn(100), 
                 'trace2': np.random.randn(100)+10, 
                 'trace3': np.random.randn(100)+20})

# multiple line plot
plt.plot( 'x', 'trace1', data=df, marker='', color='black', linewidth=2)
plt.plot( 'x', 'trace2', data=df, marker='', color='black', linewidth=2)
plt.plot( 'x', 'trace3', data=df, marker='', color='black', linewidth=2, label="GluK1c")
plt.legend()

I'm not in love with that hack (adding numbers to each trace y-value) since there ought to be a way to offset your y-axis values within matplotlib but I couldn't find that option when googling.

In this case, because you want minimalist black line traces (what neuroscience journals expect), matplotlib and seaborn are comparable.

For a plethora of legend position/formatting options, see https://matplotlib.org/3.1.1/api/_as_gen/matplotlib.pyplot.legend.html

I wish I had these tools when I worked in a lab. Would have been so much nicer than what I did back then.

Answer 2

你可以这样做，例如：

your_df.plot(subplots=True, layout=(10,30));