Generating A Matlibplot Bar Chart From Two Columns Of Data
I am trying to build a vertical bar chart based on the examples provided in How to plot a very simple bar chart (Python, Matplotlib) using input *.txt file? and pylab_examples exam
Solution 1:
x, y = line.split() returns a tuple of strings. I believe you need to convert them to ints and floats. You also need values.append(x) and values.append(y).
import numpy as np
import matplotlib.pyplot as plt
data = """100 0.0
5 500.25
2 10.0
4 5.55
3 950.0
3 300.25"""
counts = []
values = []
for line in data.split("\n"):
x, y = line.split()
values.append(int(x))
counts.append(float(y))
plt.bar(counts, values)
plt.show()
Given the 100 value in the first line (compared to <= 5 for the rest), it makes for a pretty ugly bar chart though.
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