problem with pseudo random number generator in python

[jeitjes]

Hi,

I use the pseudo random number generator from python
This is the code

random_number = random()
random_number = int(round(random_number * 99 + 1))

I use this to get random numbers from 1-100. I collected a lot of random numbers this way and analyzed whether every number was drawn aproximately 1% of the time. This is the case EXCEPT for the numbers 1 and 100 which are drawn approximately 0.5 % of the time. What am I doing wrong. Obviously I want all the numbers to be drawn about 1% of the time.

Many thanks in advance,

Jeroen Eitjes

 

[EBGreen]

I would suggest using randint() instead. Here are the results that I got using randint(1, 100) for many trials:

1 = 1.0023%
2 = 1.0%
3 = 0.9982%
4 = 1.0046%
5 = 0.9953%
6 = 0.9913%
7 = 0.99%
8 = 1.0027%
9 = 1.0009%
10 = 1.0198%
11 = 1.0212%
12 = 1.0047%
13 = 1.0179%
14 = 0.9945%
15 = 0.9853%
16 = 0.9904%
17 = 0.9932%
18 = 0.9972%
19 = 0.9936%
20 = 0.9935%
21 = 0.9968%
22 = 0.9979%
23 = 1.0085%
24 = 0.9909%
25 = 1.0026%
26 = 0.9883%
27 = 1.0093%
28 = 0.9998%
29 = 0.9928%
30 = 1.0084%
31 = 0.9943%
32 = 1.0072%
33 = 1.0219%
34 = 1.007%
35 = 1.0091%
36 = 1.0049%
37 = 1.0036%
38 = 1.011%
39 = 1.0035%
40 = 1.0056%
41 = 0.9968%
42 = 0.9865%
43 = 1.0027%
44 = 1.016%
45 = 0.9977%
46 = 1.0033%
47 = 1.0047%
48 = 0.9837%
49 = 1.0138%
50 = 1.0059%
51 = 0.9968%
52 = 0.9916%
53 = 0.9992%
54 = 0.9996%
55 = 0.997%
56 = 1.0068%
57 = 0.9909%
58 = 1.0097%
59 = 0.9798%
60 = 1.0197%
61 = 1.0082%
62 = 0.9814%
63 = 0.999%
64 = 1.0026%
65 = 0.9906%
66 = 0.9954%
67 = 0.9997%
68 = 1.0164%
69 = 1.0023%
70 = 0.997%
71 = 0.9983%
72 = 0.9998%
73 = 0.9965%
74 = 0.9897%
75 = 1.0031%
76 = 1.0049%
77 = 0.9879%
78 = 1.0102%
79 = 0.9969%
80 = 0.9997%
81 = 0.9746%
82 = 0.9962%
83 = 0.9842%
84 = 1.0141%
85 = 1.0055%
86 = 0.9785%
87 = 1.0164%
88 = 1.0343%
89 = 1.0016%
90 = 1.0067%
91 = 0.9981%
92 = 0.9936%
93 = 0.9763%
94 = 0.9998%
95 = 0.991%
96 = 0.9977%
97 = 1.0001%
98 = 0.9987%
99 = 1.0009%
100 = 0.9899%

[red]"... isn't sanity really just a one trick pony anyway?! I mean, all you get is one trick, rational thinking, but when you are good and crazy, oooh, oooh, oooh, the sky is the limit!" - The Tick[/red]