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