# Histogram appearance

Hi,

Please find attached a simple histogram created using the hist()
function. Any idea why the last two bars are squeezed into each other?
Is there a simple way to fix this while plotting?

Thanks,
Amit.

It looks like the bins are set up so that there are empty bins between each of the other bars. How are you setting the bins? You could try adjusting the bin boundaries.

···

On 2014-12-03 12:39, Amit Saha wrote:

Hi,

Please find attached a simple histogram created using the hist()
function. Any idea why the last two bars are squeezed into each other?
Is there a simple way to fix this while plotting?

--
Brendan Barnwell
"Do not follow where the path may lead. Go, instead, where there is no path, and leave a trail."
--author unknown

Hi,

Please find attached a simple histogram created using the hist()
function. Any idea why the last two bars are squeezed into each other?
Is there a simple way to fix this while plotting?

It looks like the bins are set up so that there are empty bins
between each of the other bars. How are you setting the bins? You could

Thanks for the reply. This is my program:

import matplotlib.pyplot as plt
import random

def roll():
return random.randint(1, 6)

if __name__ == '__main__':
rolls = []
for i in range(1000):
rolls.append(roll())
# create a histogram plot
plt.hist(rolls)
plt.show()

So, just using the hist() function for now.

Thanks, Amit.

···

On Thu, Dec 4, 2014 at 6:45 AM, Brendan Barnwell <brenbarn@...1219...> wrote:

On 2014-12-03 12:39, Amit Saha wrote:

--
Brendan Barnwell
path, and leave a trail."
--author unknown

Hello,

try doing:

import matplotlib.pyplot as plt
import random

rolls = list()
for i in range(1000):
rolls.append(random.randint(1,6))

plt.hist(rolls, bins=6)
plt.show()

Reason why your histogram is weird is because you only can have 6 bins
in your example. But the default bin number for hist function is 10.
The borders of bins are therefore set at half intervals. When you roll
1, bin 0 to 0.6 gets incremented, when you roll 2.2 bin 2-2.6 gets
incremented, but the bin 0.6-2.2 never does.

Follow me? (also I just made those numbers up...) Point is only the
bottom bins of your roll values are filled which leaves a gap in your
image.

Dino

2014-12-03 21:51 GMT+01:00 Amit Saha <amitsaha.in@...287...>:

···

On Thu, Dec 4, 2014 at 6:45 AM, Brendan Barnwell <brenbarn@...1219...> wrote:

On 2014-12-03 12:39, Amit Saha wrote:

Hi,

Please find attached a simple histogram created using the hist()
function. Any idea why the last two bars are squeezed into each other?
Is there a simple way to fix this while plotting?

It looks like the bins are set up so that there are empty bins
between each of the other bars. How are you setting the bins? You could

Thanks for the reply. This is my program:

import matplotlib.pyplot as plt
import random

def roll():
return random.randint(1, 6)

if __name__ == '__main__':
rolls = []
for i in range(1000):
rolls.append(roll())
# create a histogram plot
plt.hist(rolls)
plt.show()

So, just using the hist() function for now.

Thanks, Amit.

--
Brendan Barnwell
path, and leave a trail."
--author unknown

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Hi,

···

On Thu, Dec 4, 2014 at 7:01 AM, Dino Bektešević <ljetibo@...1896....> wrote:

Hello,

try doing:

import matplotlib.pyplot as plt
import random

rolls = list()
for i in range(1000):
rolls.append(random.randint(1,6))

plt.hist(rolls, bins=6)
plt.show()

Reason why your histogram is weird is because you only can have 6 bins
in your example. But the default bin number for hist function is 10.
The borders of bins are therefore set at half intervals. When you roll
1, bin 0 to 0.6 gets incremented, when you roll 2.2 bin 2-2.6 gets
incremented, but the bin 0.6-2.2 never does.

Thanks. That helps me in my understanding. Choosing bins = 6 fixes the
problem I reported.

Best,
Amit.