Sample a Few Elements of an Object

Randomly select a few elements of an object, typically a data frame, matrix, vector, or list. If the object is a data frame or a matrix, then rows are sampled.

some(x, ...)

# S3 method for class 'data.frame'
some(x, n=10, cols=NULL, ...)

# S3 method for class 'matrix'
some(x, n=10, cols=NULL, ...)

# Default S3 method
some(x, n=10, ...)

Arguments

x

the object to be sampled.

n

number of elements to sample.

cols

if NULL, use all columns, if a vector of column names or numbers, use only the columns indicated

...

arguments passed down.

Value

Sampled elements or rows.

Author

John Fox jfox@mcmaster.ca

References

Fox, J. and Weisberg, S. (2019) An R Companion to Applied Regression, Third Edition, Sage.

Note

These functions are adapted from head and tail in the utils package.

See also

head, tail, brief.

Examples

some(Duncan)
#>                type income education prestige
#> minister       prof     21        84       87
#> conductor        wc     76        34       38
#> contractor     prof     53        45       76
#> factory.owner  prof     60        56       81
#> machinist        bc     36        32       57
#> auto.repairman   bc     22        22       26
#> truck.driver     bc     21        15       13
#> barber           bc     16        26       20
#> soda.clerk       bc     12        30        6
#> janitor          bc      7        20        8
some(Duncan, cols=names(Duncan)[1:3])
#>                  type income education
#> engineer         prof     72        86
#> undertaker       prof     42        74
#> lawyer           prof     76        98
#> welfare.worker   prof     41        84
#> conductor          wc     76        34
#> contractor       prof     53        45
#> store.manager    prof     42        44
#> plumber            bc     44        25
#> machine.operator   bc     21        20
#> shoe.shiner        bc      9        17