mode_selection: Logical operations under different selection mode
In ggobi/cranvas: Interactive statistical graphics based on Qt

Description Usage Arguments Details Value Author(s) See Also Examples

A selection mode is essentially a logical operation like AND, OR, and XOR, etc.

1	mode_selection(x, y, mode = "none")

`x`	logical: the previous selection status
`y`	logical: the current selection status (if `y` is a numeric vector, it will be converted to a logical vector of the same length with `x` with `TRUE`'s corresponding to the numeric indicies)
`mode`	the selection mode string; see Details

There are five selection modes:

none: ignore previous selection and completely start over again
and: select the intersection, i.e. the objects that are selected by two successive brushing operations
or: select the union, i.e. any objects selected by all previous operations and the current operation
xor: toggle the selection
not: negation, i.e. exclude the objects under two successive brushing operations
complement: the complement of the current selection

We can hold the key while brushing: A for 'and', O for 'or', X for 'xor', N for 'not' and C for 'complement'.

a logical vector indicating whether the objects are selected

Yihui Xie <http://yihui.name>

&, |, xor, !

x1 <- c(TRUE, TRUE, FALSE, FALSE)
x2 <- c(FALSE, TRUE, TRUE, FALSE)
mode_selection(x1, x2, "none")
mode_selection(x1, x2, "and")
mode_selection(x1, x2, "or")
mode_selection(x1, x2, "xor")
mode_selection(x1, x2, "not")
mode_selection(x1, x2, "complement")

mode_selection(x1, c(2, 3), "and")  # equivalent to x2