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Compute the Value of Poisson Density in R Programming – dpois() Function

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  • Last Updated : 04 Jan, 2022
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dpois() function in R Language is used to compute the Poisson Density for a set of Integer values. It also creates a density plot of poisson distribution. 

Syntax: dpois(vec, lambda)
Parameters: 
vec: Sequence of integer values 
lambda: Average number of events per interval 

Example 1: 

Python3




# R program to compute
# Poisson Density
 
# Sequence of x-values
x <- seq(-10, 10, by = 1)
 
# Calling dpois() Function
y <- dpois(x, lambda = 5)
y

Output: 

 [1] 0.000000000 0.000000000 0.000000000 0.000000000 0.000000000 0.000000000
 [7] 0.000000000 0.000000000 0.000000000 0.000000000 0.006737947 0.033689735
[13] 0.084224337 0.140373896 0.175467370 0.175467370 0.146222808 0.104444863
[19] 0.065278039 0.036265577 0.018132789

Example 2: 

Python3




# R program to compute
# Poisson Density
 
# Sequence of x-values
x <- seq(-10, 20, by = 1)
 
# Calling dpois() Function
y <- dpois(x, lambda = 15)
 
# Plot a graph
plot(y)

Output: 

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