CODEWITHSUNDEEP
python
snehil singh
snehil singh

Reputation: 554

How to split a number into 12 random in python and all random number sum to be equal to the number

Hello guys i have a problem that that contain any number (eg- 167) will be split into 12 random numbers the sum of the 12 random numbers should be the original number And the numbers be positive, larger than zero, integers

for this i have written a code :

a = 167
n = 12
out = diff([0,sort(randperm(a-1,n-1)),a])

here i'm getting a error

name 'diff' is not defined

Another way:

a =  50390
b = rand(10,1)
b  = b/sum(b)*a
out=round(b)
out(1) = out(1) - (a-sum(out))

Note: this both code is not working so please tell me how to do it

please help me get it..thanks

Upvotes: 0

Views: 3974

Answers (2)

geofurb
geofurb

Reputation: 489

This should do it.

from random import randint
a = 167
n = 12

assert a >= n >= 1

pieces = []
for idx in range(n-1):
    # Number between 1 and a
    # minus the current total so we don't overshoot
    # minus 1 for each number that hasn't been picked
    # so they can all be nonzero
    pieces.append(randint(1,a-sum(pieces)-n+idx))
pieces.append(a-sum(pieces))

Note that these numbers aren't independent; any time you add a constraint like THE n VALUES MUST TOTAL a, you're taking away some of the randomness. Here, the numbers later in the distribution are likely to be smaller than the earlier numbers, until the last number which is expected to be average again. If you don't like that trend, you can shuffle() the resultant list, pieces.

Edit: For floats, you don't have to save space for the next value (ditto for non-negative int instead of positive int), so it'd look a little different. Basically, you just remove the -n+idx term from the expression, since you no longer need to allocate n-idx more pieces >=1.

from random import uniform
a = 166.667
n = 12

assert a > 0
assert n >= 1

pieces = []
for idx in range(n-1):
    # Number between 0 and a
    # minus the current total so we don't overshoot
    pieces.append(uniform(0,a-sum(pieces)))
pieces.append(a-sum(pieces))

Upvotes: 6

Rudolf Morkovskyi
Rudolf Morkovskyi

Reputation: 869

def num_pieces(num,lenght):
    ot = list(range(1,lenght+1))[::-1]
    all_list = []
    for i in range(lenght-1):
        n = random.randint(1, num-ot[i])
        all_list.append(n)
        num -= n
    all_list.append(num) 
    return all_list

num_pieces(167,12)

Upvotes: 1

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