inc: In-place operations

In spsUtil: 'systemPipeShiny' Utility Functions

In-place operations

Description

In-place operations like 'i += 1', 'i -= 1' is not support in R. These functions implement these operations in R.

Usage

inc(e1, e2 = 1)

mult(e1, e2 = 2)

divi(e1, e2 = 2)

Arguments

e1	object, most likely a numeric object
e2	the operation value, the value to add, subtract, multiply, divide of.

Details

'inc(i)' is the same as 'i <- i + 1'. 'inc(i, -1)' is the same as 'i <- i - 1'. 'mult(i)' is the same as 'i <- i * 2'. 'divi(i)' is the same as 'i <- i / 2'.

Value

No return, directly assign the value back to 'e1'

See Also

If you want [shiny::reactiveVal] version of these operators, check [spsComps](https://systempipe.org/sps/funcs/spscomps/reference/). [shiny::reactiveValues] operation will be the same as normal values.

Examples

i <- 0
inc(i) # add 1
i
inc(i) # add 1
i
inc(i, -1) # minus 1
i
inc(i, -1) # minus 1
i
x <- 1
mult(x) # times 2
x
mult(x) # times 2
x
divi(x) # divide 2
x
divi(x) # divide 2
x

spsUtil documentation built on Nov. 5, 2025, 7:36 p.m.