How to turn a simple csv into a line graph using matplotlib?

Question

I created a simple csv file with numbers that approach pi and I would like to create and store the output as a png. I have a very simple csv, each tow contains the number I want to graph and

import pandas as pd
import csv
import matplotlib.pyplot as plt

from decimal import Decimal

def create_png():

df = pd.read_csv('sticks.csv', names=["xstk", "stk"])

sumdf = df.sum(0)
num1 = sumdf['xstk']
num2 = sumdf['stk']
total = num1 + num2

aproxpi = [(2*float(total))/num1]

with open('aproxpi.csv', 'a') as pifile:
    piwriter = csv.writer(pifile, delimiter= ' ')
    piwriter.writerow(aproxpi)

Piplot = pd.read_csv('aproxpi.csv', names=['~Pi'])

#Piplot.groupby('~Pi')


Piplot.plot(title='The Buffon Needle Experiment')   




if __name__ == "__main__":
    create_png()

When I run this code nothing happens. If I use the show method on the AxesSubPlot I raise an exception. How can this be accomplished?

mwaskom · Accepted Answer · 2014-03-12 20:43:39Z

2

You need to call plt.show() to actually see the plot.

answered Mar 12, 2014 at 20:43

mwaskom

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1 Comment

Liam Pieri Over a year ago

Thank you, I attempted to call show() but did not realize it was a method of plt.

dakota · Accepted Answer · 2014-03-12 20:08:48Z

0

This code seems very incomplete - is there more you can give us?

It may be that Piplot.plot needs to have x and y specified, instead of simply a title. I believe that you need to create a new plot object and pass the data into it, rather than calling data.plot() as you are now. See the documentation.

Additionally, taking a look at this question may help.

answered Mar 12, 2014 at 20:08

dakota

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1 Comment

Liam Pieri Over a year ago

I have now edited it to show the whole code, I will try to do that now.

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