Matplotlib showing points only - not line

Question

My matplotlib graph is not showing a solid line. It only shows the actual points. I even specify the line width. Can't figure out why it's not showing up.

import matplotlib.pyplot as plt
import matplotlib.animation as animation
import time
import numpy as np
import matplotlib.dates as mdates

fig = plt.figure()
ax = fig.add_subplot(111)

graphArray = []
MyData = open("SampleText.txt","r").read()
Split_by_line = MyData.split('\n')

for item in Split_by_line:
    splitInfo = item.split(',')

    graphArrayAppend = splitInfo[0]+','+splitInfo[1]
    graphArray.append(graphArrayAppend)
datestamp, value= np.loadtxt(graphArray,delimiter=',', unpack=True,
                             converters={ 0: mdates.strpdate2num('%Y-%m-%d')})

ax.plot_date(x=datestamp, y=value, linewidth=2)

plt.show()

SampleText.csv

2014-01-01,6
2014-01-02,9
2014-01-03,4
2014-01-04,7
2014-01-05,7
2014-01-06,4
2014-01-07,4

Marius · Accepted Answer · 2015-01-08 04:29:57Z

3

The default value of the fmt (format) argument to plot date is 'o', for drawing points. Replace it with - to draw a line:

ax.plot_date(x=datestamp, y=value, fmt='-', linewidth=2)

answered Jan 8, 2015 at 4:29

Marius

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