Creating a histogram for the data in Python

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I have created a function in Python that computes the histogram of data. It has parameter bins that specifies no. of division.

I have given my code below:

import numpy as np
def histogram_using_numpy(filename, bins=10):
    datas =  np.loadtxt(filename, delimiter=" ", usecols=(0,))
    hist,bin_edges = np.histogram(datas, bins)
    return hist
print "from numpy %s" % histogram_using_numpy("ex.txt", bins=10)

def histogram_using_list(filename, bins=10, take_col=0):
    f = open(filename,"r")
    data = []
    for item in f.readlines():
        data.append(float(item.split()[take_col]))
    f.close()
    mi,ma = min(data), max(data)
    bin_length = (ma-mi)/bins
    def get_count(lis,low,diff):
        count = 0
        for item in lis:
            if item >= low and item < low + diff:
                count += 1
        return count
    tot = []    
    for i in np.arange(mi, ma, bin_length):
        tot.append(get_count(data,i, bin_length))
    return tot    
print "From my function %s " % histogram_using_list("ex.txt", bins=10)

Now for bins = 10 for both function. the result is:

from numpy [10 19 20 28 15 16 14 11  5 12]
From my function [10, 19, 20, 28, 16, 15, 14, 11, 5, 12] 

which is correct. but for bins = 15 I get:

from numpy [ 7  4 18 19  5 24  8 10 13  6 13  6  5  1 11]
From my function [7, 4, 18, 19, 10, 19, 8, 10, 13, 10, 9, 6, 5, 1, 11] 

which is incorrect. Is there anything wrong in my code?

asked 52 secs ago

Sarvagya Pant

87