matplotlib histogram axis formatting

Question

I have a histogram from derived from an sql database query. The code is as follows:

def histogram(self): conn = sqlite3.connect('tooldatabase.db') c = conn.cursor() c.execute('PRAGMA foreign_keys = ON') c.execute("SELECT evaluation from evaluations") evaluations=c.fetchall() print(evaluations) minimum=min(evaluations, key = lambda t: t[0]) maximum=max(evaluations, key = lambda t: t[0]) print(minimum,maximum) eval=[] for (y,) in evaluations: eval.append(y) bin=[] for x in range(1,maximum[0]+2): bin.append(x) figure=plt.figure(1) plt.hist(eval,bins=bin, facecolor='blue',edgecolor='black',) plt.xticks(bin, bin) plt.xlabel('evaluation') plt.ylabel('No of problems') plt.title('Evaluations Distribution Histogram') plt.show()

The output is as follows: https://gyazo.com/d73b20a118db0088aab261c079613b00

I would like to display it as: https://gyazo.com/063990cd8741682f45b5a37ba594ff56

Where the x-axis numbers are shifted to the right side a bit more. Is there a way possible to do this?

Possible duplicate of Matplotlib xticks not lining up with histogram — DavidG
– DavidG, Commented Apr 27, 2017 at 10:15

Serenity · Accepted Answer · 2017-04-27 10:19:02Z

I think you have to modify xticks position like:

import matplotlib.pyplot as plt import numpy as np # test data eval = np.random.randint(0,3,10) bin = np.arange(4) # len + 1 figure=plt.figure(1) plt.hist(eval,bins=bin, facecolor='blue',edgecolor='black') # shift ticks by .5 plt.xticks(bin-.5, bin) plt.xlabel('evaluation') plt.ylabel('No of problems') plt.title('Evaluations Distribution Histogram') plt.show()

plt.xticks(bin-.5, bin) TypeError: unsupported operand type(s) for -: 'list' and 'float'

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