Random Number Generator

Generate Customized Random Number Sequences

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Platforms: Windows 98, 2000, XP, Vista

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Remember that time when you were a little kid, and your brother bet you that you couldn't count all the way up to a million, and you tried and tried, and you quit somewhere around 439, dead-tired, dry-mouthed, and with nothing to show for it? In programming, such is the case with random number generation - a simple concept that can get a little complex in the execution.

Sooner or later, you're going to want to produce a set of random numbers for your programming project. It's not as simple as designating minimum and maximum values either - depending on what you need it for, you may want to exclude certain digits from your random number set, or have one or two numbers only show up once - like if you were programming a lottery machine, for example.

Random Number Generator creates random number sequences that can be configured according to your needs. In addition to specifying the range of numbers, you can also designate the number of random numbers to be generated, and whether those numbers should be unique. What's more, you can limit your random number sequence to even or odd integers, and exclude certain digits (like, if you were hating on the number '9', for instance) from the set.

In addition to integers, Random Number Generator is equally capable of doling out sequences of random floating point numbers. Designate a delimiter of your choice to separate each number from its neighbor, and when all is said and done, you can save your output for use in your program!

With Random Number Generator, you are the king of random number sequences!

Review Written by Derek Lee

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Expand All Email Updates Load 13 Older Comments

Big Bad Wolf # Does what this software does, in fact even better
# You can generate different distribution (e.g. gauss)
# by changing random.random() to something else.
# Time taken? 1hr inclusive of testing

import random

exclude_digits = '12345'
min_value = 0
max_value = 1000
number_of_values = 100
decimal_places = 0

want_unique = True
values = []

while len(values) number_of_values:

number = random.random() * max_value + min_value
str_num = str(number)

for exclude_digit in exclude_digits:
str_num = str_num.replace(exclude_digit, '')

decimal_pos = str_num.find('.')

if decimal_places 0:
if (decimal_pos 0) and ((len(str_num) - decimal_pos - 1) decimal_places):
str_num = str_num[0:decimal_pos + 1 + decimal_places]
else:
continue
else:
str_num = str_num[0:decimal_pos]

str_num = str_num.lstrip('0')
if len(str_num) 1: continue

if str_num[0] == '.':
str_num = '0'.join(str_num)

if want_unique:
if values.count(str_num) 0: continue

values.append(str_num)
print len(values), ':', str_num

Feb 8 2009 at 2:41am Copy Link

Dave Yankov There you go again, Big Bad Wolf.

You're assuming the user has Visual Studio Express or even the desire or knowledge to use it.

Once again, here's an easy-to-use random number generator.

Much easier to use than some lava lamps.

Feb 8 2009 at 11:20am Copy Link

Stephen Cohen Whether this program generates good sequences of pseudo-random numbers or not depends on the algorithm used. There are very good and very bad algorithms.

By definition, forcing the elimination of a digit, such as "9" or forcing uniqueness destroys randomness. Besides, unless the numbers are rounded to a few digits, a truly random sequence will have an infinitesimal probability of having duplicates.

I assume that the software's default is to generate uniform pseudo-random sequences. There are statistical tests for both uniformity and randomness. These tests cannot PROVE that an algorithm generates truly uniform or random sequences, but if testing indicates non-uniformity or non-randomness, then the algorithm is almost certainly a poor one. I discovered this almost 30 years ago with the random number generator in a Casio scientific calculator. It was quite bad.

Feb 14 2009 at 5:20pm Copy Link

Martin Jay I've had a play, but I don't really have much use for this type of software.

I've noticed it appears to get itself in an endless loop if it's asked to perform an impossible task, such as producing ten unique random numbers of two digits that contain only 1 and 9.

Feb 15 2009 at 1:35am Copy Link