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.

Usage

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.

Examples

some(Duncan)
#>                  type income education prestige
#> accountant       prof     62        86       82
#> professor        prof     64        93       93
#> factory.owner    prof     60        56       81
#> bookkeeper         wc     29        72       39
#> insurance.agent    wc     55        71       41
#> machinist          bc     36        32       57
#> plumber            bc     44        25       29
#> taxi.driver        bc      9        19       10
#> machine.operator   bc     21        20       24
#> waiter             bc      8        32       10
some(Duncan, cols=names(Duncan)[1:3])
#>                type income education
#> professor      prof     64        93
#> dentist        prof     80       100
#> carpenter        bc     21        23
#> electrician      bc     47        39
#> RR.engineer      bc     81        28
#> auto.repairman   bc     22        22
#> taxi.driver      bc      9        19
#> truck.driver     bc     21        15
#> bartender        bc     16        28
#> watchman         bc     17        25