Number of observations in a given object

nobs is a generic function to return the number of observations from a model. shuffle provides a few methods for other types of data object in R.

# S3 method for class 'numeric'
nobs(object, ...)

# S3 method for class 'integer'
nobs(object, ...)

# S3 method for class 'matrix'
nobs(object, ...)

# S3 method for class 'data.frame'
nobs(object, ...)

# S3 method for class 'character'
nobs(object, ...)

# S3 method for class 'factor'
nobs(object, ...)

Arguments

object

a data frame or matrix, or a numeric, integer, character, or factor vector.

...

arguments to other methods.

Details

Function nobs is a simple generic function to return the number of observations in a range of R model objects. Methods are provided to work with a variety of R objects.

Value

The (numeric) number of observations in object.

Author

Gavin Simpson

Examples

set.seed(1)
## numeric vector
len <- sample(1:10, 1)
v <- as.numeric(sample(1:100, len))
len
#> [1] 3
obs <- nobs(v)
isTRUE(all.equal(len, obs))
#> [1] TRUE

## integer
len <- sample(1L:10L, 1)
obs <- nobs(len)
isTRUE(all.equal(len, obs))
#> [1] FALSE