CODEWITHSUNDEEP
pythonmatplotlibplothistogram
Ayan Mitra
Ayan Mitra

Reputation: 525

Histogram with two variable in matplotlib

I have a data set like this :

ID  z  N
0   0.15    69.0
1   0.25    208.0
2   0.35    402.0
3   0.45    223.0
4   0.55    327.0
5   0.65    136.0
6   0.75    136.0
7   0.85    136.0
8   0.95    136.0
9   1.05    136.0
10  1.15    136.0
11  1.25    136.0
12  1.35    136.0
13  1.45    136.0
14  1.55    136.0
15  1.65    136.0

I would like to make a plot this enter image description here

I cannot find the way out. A simple plt.hist() is a single function plot. Or a plt.bar(z,N) wont dissolve the lines between bars.

Upvotes: 3

Views: 639

Answers (1)

Benedictanjw
Benedictanjw

Reputation: 838

That's because plt.hist is expecting a list of values from which it will calculate the frequencies. Since you already have the frequencies, you could remake the list of values and let plt.hist work the way it was made to

import matplotlib.pyplot as plt

z = [0.15, 0.25, 0.35, 0.45, 0.55, 0.65, 0.75, 0.85, 0.95, 1.05, 1.15, 1.25, 1.35, 1.45, 1.55, 1.65]
N = [69.0, 208.0, 402.0, 223.0, 327.0, 136.0, 136.0, 136.0, 136.0, 136.0, 136.0, 136.0, 136.0, 136.0, 136.0, 136.0]
hist_vals = []
for n,zz in zip(N,z):
    hist_vals += [zz]*int(n)
plt.hist(hist_vals,bins=z+[1.7], histtype='step', edgecolor='k')
plt.show()

Histogram

Upvotes: 4

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