All Questions
Tagged with probability python-3.x
86
questions
30
votes
5
answers
31k
views
Create Bayesian Network and learn parameters with Python3.x [closed]
I'm searching for the most appropriate tool for python3.x on Windows to create a Bayesian Network, learn its parameters from data and perform the inference.
The network structure I want to define ...
- 483
6
votes
2
answers
316
views
How can I generate random numbers given I have probability of varous ranges specified in python
I want to fill in the dummy data of attendance. I want that,for example, 60% students have attendance in the range of 70-100,25% in the range of 40-60 and 15% in the range of 0-40. How can I generate ...
5
votes
2
answers
26k
views
Probability Mass Function of a Binomial Distribution in Python
I am using Python3 to compute the Probability Mass Function (PMF) of this wikipedia example:
I tried to follow this scipy documentation:
https://docs.scipy.org/doc/scipy-0.19.0/reference/generated/...
user7120460
4
votes
1
answer
2k
views
About how numpy.random.choice works
I'm trying to writing a program that simulate the Coupon collector's problem. Here is quick reference for the problem:
Given n coupons, how many coupons do you expect you need to draw with
...
- 193
4
votes
1
answer
1k
views
How is scipy.stats.multivariate_normal.pdf different from the same function written using numpy?
I need to use the multivariate normal distribution in a script. I have noticed that my version of it gives a different answer from scipy's method. I can't really figure out why...
Here is my function:...
- 43
3
votes
2
answers
3k
views
How to select items from a list based on probability
I have lists a and b
a = [0.1, 0.3, 0.1, 0.2, 0.1, 0.1, 0.1]
b = [apple, gun, pizza, sword, pasta, chicken, elephant]
Now I want to create a new list c of 3 items
the 3 items are chosen form list ...
- 330
3
votes
3
answers
2k
views
probability of T total eyes when throwing N dice with S sides
I want to calculate the probability of the event that the sum of all eyes of n dice with s sides (numbered from 1 to s) is equal to t. My language is Python 3.
My current approach is pretty much a ...
- 6,610
3
votes
4
answers
2k
views
Python program that simulates rolling a 6 sided die and adds up the result of each roll till you roll a 1
so this is the code I wrote that attempts to answer the question in the title :
import random
print("Well, hello there.")
while True:
a = random.randint(1,6)
sum = 0
if(a==1): #If a one ...
- 53
2
votes
1
answer
2k
views
Probability distributions and float variables, probability must add to 1
I'm working on a script which goes like this: the program analyses a bunch of text documents in a certain language, draws the probability distributions for each k, where k is the first character ...
- 1,182
2
votes
1
answer
213
views
Function interpreter in python
Suppose I have a function in Python that includes mathematical expressions from Python's base and some mathematical expressions from Numpy and Scipy, including maybe some distributions. As a running ...
- 205
2
votes
1
answer
3k
views
memory error by using rbf with scipy
I want to plot some points with the rbf function like here to get the density distribution of the points:
if i run the following code, it works fine:
from scipy.interpolate.rbf import Rbf # radial ...
- 189
2
votes
1
answer
55
views
Indexing dynamic vector of class probabilities
For my code, I have a large (up to 40,000) vector of class probabilities. This set of class probabilities also needs to be reweighted regularly, so assume it will change on every call of the code. The ...
1
vote
2
answers
2k
views
python: choose element from a list following a certain probability
I'm looking for a python function that would allow me, given a list and a certain probability, to return only the elements that "pass" the lottery. For instance:
my_list = ['A', 'B', 'C']
...
- 2,760
1
vote
3
answers
209
views
Calculating with items enclosed in list positions (genetic algorithms fitness)
population = [[[0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1], [1], [0]],
[[0, 0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1], [3], [1]],
[[0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0], [4], [2]],...
- 459
1
vote
1
answer
4k
views
How do I calculate the probability of every value in a dataframe column quickly in Python？
I want to calculate the probability of all the data in a column dataframe according to its own distribution.For example,my data like this:
data
0 1
1 1
2 2
3 3
4 2
5 ...
- 6,138
1
vote
2
answers
577
views
Calculating conditional probability from list
Trying to calculate the conditional probability from a given list. Say I have the following list:
[[ 1, 0, 0, 0, 1, 5],
[ 0, 1, 0, 1, 0, 3],
[ 1, 0, 0, 0, 1, 5],
[ 0, 0, 1, 1, 0, 2],
[ 0, 0, 1, 0, ...
- 67
1
vote
2
answers
286
views
How to skew random choice probability towards one option?
I am using the random library in python to select win or lose.
import random
choice = random.choice(['win','lose'])
Is there anyway I can say set the probability in the code to say I want more ...
- 3,577
1
vote
2
answers
3k
views
How can I calculate probability for all each numpy value at once?
I have a function for calculating probability like below:
def multinormpdf(x, mu, var): # calculate probability of multi Gaussian distribution
k = len(x)
det = np.linalg.det(var)
inv = np....
- 445
1
vote
1
answer
1k
views
Generate exponential distribution in Python
I'm aware of the random.expovariate function but this is not what I need.
I'd like to generate a stream of length N in which each element i between 1 and M is chosen with probability 1/(2^(i+1))
Thus,...
- 263
1
vote
1
answer
262
views
probability difference between categorical target and one-hot encoding target using OneVsRestClassifier
A bit confused with the probability between categorical target and one-hot encoding target from OneVsRestClassifier of sklean. Using iris data with simple logistic regression as an example. When I use ...
- 147
1
vote
1
answer
297
views
Generate one sample following two different distributions
I would like to generate randomly a sample in the interval [0;1000] of size 1E4. But following two different distribution : one in the [0;1] interval following an increasing exponential distribution ...
- 332
1
vote
1
answer
1k
views
Python - Trigram Probability Distribution Smoothing Technique (Kneser Ney) in NLTK Returns Zero
I have the frequency distribution of my trigram followed by training the Kneser-Ney.
When I check for kneser_ney.prob of a trigram that is not in the list_of_trigrams I get zero! What am I doing wrong?...
- 717
1
vote
1
answer
69
views
Is there a way to find the probability of different values in matrices
I thought there would be a library that would help me to do this task instead of writing many lines of codes. I tried finding some solutions from books related to my problem, but I could not find any. ...
1
vote
1
answer
301
views
Is there a way to calculate probability with probability tree instead of simulation
I want to implement a function in python that gives me the exact probability (if possible in fraction form) of my following problem:
You have a list of 8 elements let's say l=[1,2,3,4,5,6,7,8], then ...
- 115
1
vote
2
answers
69
views
How do I combine later elements of a list to earlier elements, while maintaining the list’s order prior to those later elements?
Long story short, I’m rolling unfair dice and trying to find the probability of any given sum after x number of rolls. In practice there are hundreds of faces and hundreds of rolls, so I can't simply ...
- 13
1
vote
1
answer
2k
views
How can I use Python to convert an adjacency matrix to a transition matrix?
I am trying to convert a matrix like
1 1 0
0 1 1
0 1 1
to become
1 ⅓ 0
0 ⅓ ½
0 ⅓ ½
I was thinking about summing the rows and then dividing by them, but I was wondering if there was a better way ...
- 704
1
vote
1
answer
9k
views
Python program that runs a game of pig with a human player and the computer
So in a nutshell, who goes first is decided randomly. When the human players turn does come up, he/she has the option to either hold or roll. If he chooses to roll, a dice is rolled and the values are ...
- 53
1
vote
1
answer
1k
views
Python program that calculates the probability of getting 1 at least twice when rolling a fair die 12 times
import random
import sys
bestcounter1 = 0
bestcounter2=0
get_sample = int(sys.argv[1])
for i in range(get_sample):
for i in range(12):
if (random.randint(1,6)==1):
...
- 53
1
vote
1
answer
202
views
Iteration performance
I made a function to evaluate the following problem experimentally, taken from a A Primer for the Mathematics of Financial Engineering.
Problem: Let X be the number of times you must flip a fair ...
- 1,791
1
vote
1
answer
402
views
Cumulative sum of relative probabilities in an non-ordered list
population_d = {'0,0,1,0,1,1,0,1,1,1,1,0,0,0,0,1': 6,
'0,0,1,1,1,0,0,1,1,0,1,1,0,0,0,1': 3,
'0,1,1,0,1,1,0,0,1,1,1,0,0,1,0,0': 5,
'1,0,0,1,1,1,0,0,1,1,0,1,1,0,0,0': 1}
def ProbabilityList(...
- 459
1
vote
1
answer
4k
views
Calculate probabilities in a probability tree
I have the following dictionary:
dict = {1000021: [[0.6, [1000024, 1, -2]], [0.4, [1000022, 21]]],
1000024: [[0.7, [1000022, 11, -12]], [0.3, [1000022, 2, -1]]]}
which corresponds to the ...
- 14.7k
1
vote
0
answers
70
views
Can i make SimPy Sum(Indexed(Random_probabilistic_Variable, i ), (i,1,n)) works?
from sympy import *
from sympy.stats import *
init_printing(use_unicode=True)
x, y, a, b, i, n, t, z, mi, sigma, theta, μ, σ, σ2, θ, λ = symbols('x y a b i n t z mi sigma theta μ σ σ2 θ λ')
pdf = θ*...
1
vote
2
answers
111
views
Loop over finite probability weights with SciPy/NumPy
Let us have a single event probability prob which is a scalar between 0-1. If I want to iterate over every possible probability with 0.1 increments, then I can use:
prob = np.arange(0.01, 1, 0.1)
...
1
vote
0
answers
40
views
My own methods return None instead of a valid value
My own class methods do not work when I check how my function 'linker' operates. These methods return None value.
When I run these methods in the interactive mode, they work and each returns a new ...
- 357
1
vote
1
answer
63
views
Relating The Concept of All Possible Outcomes With Number of Angles (& Sides) Within a Polygon
I am trying to find all possible angles and sides in a given shape. However, I am struggling. This is the start of my code.
SidesNumber = int(input("How many sides does your shape have: "))
...
- 23
0
votes
2
answers
2k
views
Determine all combinations of flipping a coin without using "itertools.product"
I went through similar posts on the forum but all of them suggest using itertools.product but I was wondering if it can be solved without using it.
I want to print all the combinations of outcomes ...
- 1,247
0
votes
2
answers
141
views
calculate conditional probability
Input
cust_Id category product purchased
1 Elec light 0
1 Elec light 1
1 Elec light 0
1 HA Table 1
1 HH Pen 1
2 ...
- 123
0
votes
1
answer
1k
views
python3: normalize matrix of transition probabilities
I have a Python code partially borrowed from Generating Markov transition matrix in Python:
# xstates is a dictionary
# n - is the matrix size
def prob(xstates, n):
# we want to do smoothing, so ...
- 6,192
0
votes
2
answers
2k
views
Using Monte Carlo method to find a specific probability of a certain dice output in Python 3.2
I'm in a statistics class and we are constantly being given "dice problems" with various constrains. This is a probability problem, where I need to evaluate the probability of an event by using the ...
- 41
0
votes
1
answer
23
views
TF1 from TF2 How to get the probability of the model?
Hi I have the following model generated and I have successfully convert the TF 1 example o TF 2 using the Tf migration script.
Here is the model:
tf.compat.v1.reset_default_graph
X = tf.compat....
- 7,195
0
votes
1
answer
432
views
Find probability of a single occurrence in map_query in pgmpy
I am working on a bayesian network which looks like this
bn
I want to find the probability of P(+j|-e) which means that finding the probability that JohnCalls is true given earthquake is false. Here ...
user11665646
0
votes
1
answer
325
views
How to calculate the probability in the event that a number is not the one from the list?
I have a list:
lst = [10,20,39,50]
How to calculate the probability in Python that a number picked up from the list is not 10? (An event can be supposed)
- 986
0
votes
1
answer
303
views
Write a program that counts the number of occurrences of "11" in an input sequence of zeros and ones in PYTHON3
Suppose I enter a list like [0,0,1,1,1,0], the program should print 2. I wrote a simple program like this:
def count11(seq):
n= len(seq)
print (n)
cnt=0
#i=0;
print(cnt)
#...
0
votes
1
answer
561
views
Get topic probability distribution for new document
I have a working topic model called model, with the following settings:
model = LdaModel(corpus=corpus,
id2word=id2word,
num_topics=10,
...
- 1,622
0
votes
3
answers
249
views
How to get random index of the array without current idx?
I'm iterating over a list (numpy array with one dimension to be exact) and I need to pick an index form this list that is random and different than current iterator.
The most important thing is ...
- 23
0
votes
1
answer
602
views
Python: Roll a dice for 12 times, calculate the probability if each number equally shows up twice
I've drafted the below code for the captioned question, but the return result is always 0. Could anyone please help me figure out what's the problem here?
Thanks a lot!
import random
dice_sides = 6
...
- 21
0
votes
1
answer
1k
views
Downsample numpy array while preserving distribution
I'm trying to write a function that can randomly sample a numpy.ndarray that has floating point numbers while preserving the distribution of the numbers in the array. I have this function for now:
...
- 1,114
0
votes
2
answers
4k
views
Python program that simulates a game of dice with both players controlled by the computer
The program should randomly choose which player goes first. It
should keep a total score for each player, and alternate turns between
the computer players until one player ends its turn with a score ...
- 53
0
votes
1
answer
1k
views
Python program that simulates a full one player game of pig, starting at a totalscore of 0 and playing turn after turn until it reaches 100 points
So here is a sample output:
- rolled a 2
- rolled a 1
Pigged out!
Turn score = 0
New total score = 0
- rolled a 1
Pigged out!
Turn score = 0
New total ...
- 53
0
votes
1
answer
130
views
Python generate random right skewed gaussian with constraints
I need to generate a unit curve that is going to look like a right skewed gaussian and I have the following constraints:
The X axis is Days (variable but usually 45+)
All values on the Y axis sum to ...
- 2,053