Poker Simulation – Probability of Hands

In this script, we are simulating poker hands and estimating the probability of each hand to come up. By increasing the number of simulations the execution gets slower but the estimates get more reliable. Finally, by removing or adding players the probabilities shift correspondingly.

## Poker simulator
## 10,000 hands with 2 players, neither ever folds

# clear environment and console
rm(list = ls())
cat("\014")

# install and load required packages
# install.packages('holdem')
library(holdem)

# inputs
n = 10000

# initialize variables
no_pair = rep(0, n)
one_pair = rep(0, n)
two_pairs = rep(0, n)
three_of_a_kind = rep(0, n)
straight = rep(0,n)
flush = rep(0,n)
full_house = rep(0, n)
four_of_a_kind = rep(0, n)
straight_flush = rep(0, n)

# simulate hands and track hands
for(i in 1 : n)
{
x1 = deal1(2)
b1 = handeval(c(x1$plnum1[1,], x1$brdnum1), c(x1$plsuit1[1,], x1$brdsuit1))
b2 = handeval(c(x1$plnum1[2,], x1$brdnum1), c(x1$plsuit1[2,], x1$brdsuit1))
if(min(b1,b2) <= 999999) {no_pair[i] = 1}
if(min(b1,b2) >= 1000000 && min(b1,b2) < 2000000) {one_pair[i] = 1}
if(min(b1,b2) >= 2000000 && min(b1,b2) < 3000000) {two_pairs[i] = 1}
if(min(b1,b2) >= 3000000 && min(b1,b2) < 4000000) {three_of_a_kind[i] = 1}
if(min(b1,b2) >= 4000000 && min(b1,b2) < 5000000) {straight[i] = 1}
if(min(b1,b2) >= 5000000 && min(b1,b2) < 6000000) {flush[i] = 1}
if(min(b1,b2) >= 6000000 && min(b1,b2) < 7000000) {full_house[i] = 1}
if(min(b1,b2) >= 7000000 && min(b1,b2) < 8000000) {four_of_a_kind[i] = 1}
if(min(b1,b2) >= 8000000) {straight_flush[i] = 1}
}

# calculate probabilities per hand
pr1 = (sum(no_pair > .5) / n) * 100
pr2 = (sum(one_pair > .5) / n) * 100
pr3 = (sum(two_pairs > .5) / n) * 100
pr4 = (sum(three_of_a_kind > .5) / n) * 100
pr5 = (sum(straight > .5) / n) * 100
pr6 = (sum(flush > .5) / n) * 100
pr7 = (sum(full_house > .5) / n) * 100
pr8 = (sum(four_of_a_kind > .5) / n) * 100
pr9 = (sum(straight_flush > .5) / n) * 100

# print probabilities
paste0(pr1, '% probability of no pairs')
paste0(pr2, '% probability of one pair')
paste0(pr3, '% probability of two pairs')
paste0(pr4, '% probability of 3 of a kind')
paste0(pr5, '% probability of a straight')
paste0(pr6, '% probability of a flush')
paste0(pr7, '% probability of a full house')
paste0(pr8, '% probability of a 4 of a kind')
paste0(pr9, '% probability of a straight flush')

 

 

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