plot array from command line into graph through python

Question

I am trying to plot two arrays that are input via command line. For instance I have the program testarray.py

Now when I enter the command line

python testarray.py "1 2 3 4 5 6" "1 2 4 8 16 32"

I am trying to get a plot that looks like the following:

Unfortunately I am not getting this plot. I have a linear plot where the y axis is not linear.

Below is a snippet of my code:

xarr=np.array([])
yarr=np.array([])
zarr=np.array([])

x=sys.argv[1].split(' ')
y=sys.argv[2].split(' ')
length=len(x)

for t in range(0,length):
  xarr = np.append(xarr,x[t])
  yarr = np.append(yarr,y[t])
plt.plot(xarr,yarr,'b')

How do I tweak this code to get the desired result?

Unfortunately I am not getting this plot. What are you getting instead? Please provide a minimal reproducible example. — AMC
– AMC, Commented Aug 5, 2020 at 0:07

lurad101 · Accepted Answer · 2020-08-05 07:12:17Z

1

This code works. Before you plot, you must convert the numbers that are of type string to integer.

import sys
import matplotlib.pyplot as plt

if __name__ == '__main__':
    x=sys.argv[1].split(' ')
    y=sys.argv[2].split(' ')
    for i in range(len(x)):
        x[i] = int(x[i])
        y[i] = int(y[i])
    plt.plot(x, y)
    plt.show()

Update With the use of map you can make the whole thing even more elegant.

import sys
import matplotlib.pyplot as plt
if __name__ == '__main__':
    x=list(map(int, sys.argv[1].split(' ')))
    y=list(map(int, sys.argv[2].split(' ')))

    plt.plot(x,y,'b')
    plt.show()

edited Aug 5, 2020 at 7:12

answered Aug 5, 2020 at 0:03

lurad101

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