# Compute the Value of Negative Binomial Quantile Function in R Programming – qnbinom() Function

• Last Updated : 25 Jun, 2020

`qnbinom()` function in R Language is used to compute the value of negative binomial quantile function. It also creates a density plot of the negative binomial quantile function.

Syntax: qnbinom(vec, size, prob)

Parameters:
vec: x-values for binomial density
size: Number of trials
prob: Probability

Example 1:

 `# R program to compute value of``# Negative Binomial Quantile Function`` ` `# Vector of x-values``x <``-` `seq(``0``, ``1``, by ``=` `0.1``)`` ` `# Calling qnbinom() Function``y <``-` `qnbinom(x, size ``=` `100``, prob ``=` `0.5``)``y`

Output:

``` [1]   0  82  88  92  96  99 103 107 112 118 Inf
```

Example 2:

 `# R program to compute value of``# Negative Binomial Quantile Function`` ` `# Vector of x-values``x <``-` `seq(``0``, ``1``, by ``=` `0.01``)`` ` `# Calling qnbinom() Function``y <``-` `qnbinom(x, size ``=` `100``, prob ``=` `0.8``)`` ` `# Plot a graph``plot(y)`

Output:

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