76 lines
2.4 KiB
Python
76 lines
2.4 KiB
Python
#/usr/bin/env python
|
|
# -*- coding:Utf-8 -*-
|
|
|
|
from random import randint, uniform, gauss, choice
|
|
|
|
|
|
def random_generator(length,\
|
|
distrib = gauss, rd_args = (0,1), \
|
|
nbr_format = lambda x:round(x,2), \
|
|
v_min = None, v_max = None, \
|
|
exact_mean = None):
|
|
""" Generate a random list of value
|
|
|
|
:param length: length of the dataset
|
|
:param distrib: Distribution of the data set. It can be a function or string from ["randint", "uniform", "gauss", "choice"]
|
|
:param rd_args: arguments to pass to distrib
|
|
:param nbr_format: function which format value
|
|
:param v_min: minimum accepted value
|
|
:param v_max: maximum accepted value
|
|
:param exact_mean: if set, the last generated number will be create in order that the computed mean is exacly equal to "exact_mean"
|
|
|
|
: Exemple:
|
|
>>> random_generator(10)
|
|
>>> random_generator(10, distrib = uniform, rd_args = (5, 10))
|
|
>>> random_generator(10, distrib = "uniform", rd_args = (5, 10))
|
|
>>> random_generator(10, v_min = 0)
|
|
>>> random_generator(10, exact_mean = 0)
|
|
>>> random_generator(10, distrib = gauss, rd_args = (50,20), nbr_format = int)
|
|
|
|
"""
|
|
# if exact_mean is set, we create automaticaly only length-1 value
|
|
if exact_mean != None:
|
|
length = length - 1
|
|
|
|
# build function to test created values
|
|
if v_min == None:
|
|
v1 = lambda x: True
|
|
else:
|
|
v1 = lambda x: x >= v_min
|
|
if v_max == None:
|
|
v2 = lambda x: True
|
|
else:
|
|
v2 = lambda x: x <= v_max
|
|
validate = lambda x : v1(x) and v2(x)
|
|
|
|
# get distrib function
|
|
distribs = {"gauss": gauss, "uniform": uniform, "randint":randint, "choice":choice}
|
|
try:
|
|
distrib(*rd_args)
|
|
except TypeError:
|
|
distrib = distribs[distrib]
|
|
|
|
# building values
|
|
data = []
|
|
for _ in range(length):
|
|
valid = False
|
|
while not valid:
|
|
v = nbr_format(distrib(*rd_args))
|
|
valid = validate(v)
|
|
data.append(v)
|
|
|
|
# Build last value
|
|
if exact_mean != None:
|
|
last_v = nbr_format((length+1) * exact_mean - sum(data))
|
|
if not validate(last_v):
|
|
raise ValueError("Can't build the last value. Conflict between v_min/v_max and exact_mean")
|
|
data.append(last_v)
|
|
|
|
return data
|
|
|
|
# -----------------------------
|
|
# Reglages pour 'vim'
|
|
# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
|
|
# cursor: 16 del
|
|
|