Plotting Values in Python

March 17, 2017, at 06:03 AM

I am new to Python and I'm working on plotting values onto a graph. It seems easy but it is very hard to extract values from a CSV file.

Here is what is going on:

  • First, I do not need all values plotted. I have created a test excel sheet (CSV) to show you what I mean.

  • I also need a new line (on the graph for every new line on excel)

----denoted by the different color highlights

Lets look at the photo to get a better understanding

Light Blue= x-values for entire graph.
Green= y-values for first line.
Red= y-values for 2nd line.
Purple= y-values for 3rd line.

I would like all these lines on one graph, and each line to be labeled with the values highlighted in grey (corresponding to the below set of y-values)

Here is what i have written so far, which isolated the values i need, I just do not know how to plot them.

Sorry for such a rough explanation Thank you

Answer 1

You should use pandas to read the csv file and matplotlib to plot the lines.

import pandas
import matplot.pyplot as plt
df = pandas.read_csv('./csv_file.csv')
fig, ax = plt.subplots()
ax.plot(df['Light Blue'], df['Green'], label='Green', color='green')
ax.plot(df['Light Blue'], df['Red'], label='Red', color='red')
ax.plot(df['Light Blue'], df['Purple'], label='Purple', color='purple')

This is assuming the columns in the csv are labelled with 'Light Blue', 'Green', etc.

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