Extract or Replace Parts of an Object

S3 operators to extract or replace parts of quantities objects.

Usage

# S3 method for quantities
[(x, ...)

# S3 method for quantities
[[(x, ...)

# S3 method for quantities
[(x, ...) <- value

# S3 method for quantities
[[(x, ...) <- value

Arguments

x

object from which to extract element(s) or in which to replace element(s).

...

additional arguments to be passed to base methods (see Extract).

value

typically an array-like R object of a similar class as x.

Examples

x <- set_quantities(1:3, m/s, 0.1)
y <- set_quantities(4:6, m/s, 0.2)
(z <- rbind(x, y))
#> Units: [m/s]
#> Errors: 0.1 0.2 0.1 0.2 0.1 ...
#>   [,1] [,2] [,3]
#> x    1    2    3
#> y    4    5    6
z[2, 2]
#> 5.0(2) [m/s]
z[2, 2] <- -1
errors(z[[1, 2]]) <- 0.8 # assumes same unit
errors(z[[2, 2]]) <- set_units(80, cm/s)
z[, 2]
#> Units: [m/s]
#> Errors: 0.8 0.8
#>  x  y 
#>  2 -1