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Create Random Deviates of Uniform Distribution in R Programming – runif() Function
  • Last Updated : 25 Jun, 2020

runif() function in R Language is used to create random deviates of the uniform distribution.

Syntax: runif(n, min, max)

Parameters:
n: represents number of observations
min, max: represents lower and upper limits of the distribution

Example 1:

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# Create uniform distribution between range -1 to 1
x <- runif(20, min = -1, max = 1)
  
# Print distibution
print(x)

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Output:

 [1]  0.90453974 -0.97083088  0.83531295  0.19008941  0.52278078 -0.75730955
 [7]  0.21659920 -0.26621211  0.11967620  0.42081991  0.75518470 -0.41519833
[13] -0.03734007  0.57365077  0.76156708  0.97314141 -0.41957919 -0.08910355
[19]  0.29047038 -0.67069856

Example 2:

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# Create uniform distribution of range -5 to 5
unif <- runif(10000, min = -5, max = 5)
  
# Output to be present as PNG file
png(file = "runifGFG.png")
  
# Create Histogram
hist(unif, freq = FALSE
     xlab = 'x',  
     ylim = c(0, 0.4),
     xlim = c(-6, 6),
     density = 20,
     main = "Uniform distribution for the interval [-5, 5]")
  
# Show density of distribution using curve
curve(dunif(x, min = -5, max = 5), 
      from = -10, to = 10, 
      n = 100000, 
      col = "darkgreen"
      lwd = 2, 
      add = TRUE
      yaxt = "n",
      ylab = 'probability')
  
# Saving the file
dev.off()

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Output:




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