def {ape} | R Documentation

## Definition of Vectors for Plotting or Annotating

### Description

This function can be used to define vectors to annotate a set of taxon names, labels, etc. It should facilitate the (re)definition of colours or similar attributes for plotting trees or other graphics.

### Usage

    def(x, ..., default = NULL, regexp = FALSE)

### Arguments

`x` | a vector of mode character.
`...` | a series of statements defining the attributes.
`default` | the default to be used (see details).
`regexp` | a logical value specifying whether the statements defined in `...` should be taken as regular expressions.

### Details

The idea of this function is to make the definition of colours, etc., simpler than what is done usually. A typical use is:

`def(tr$tip.label, Homo_sapiens = "blue")`

which will return a vector of character strings all "black" except one matching the tip label "Homo_sapiens" which will be "blue". Another use could be:

`def(tr$tip.label, Homo_sapiens = 2)`

which will return a vector a numerical values all 1 except for "Homo_sapiens" which will be 2. Several definitions can be done, e.g.:

`def(tr$tip.label, Homo_sapiens = "blue", Pan_paniscus = "red")`

The default value is determined with respect to the mode of the values given with the `...` (either "black" or 1).

If `regexp = TRUE` is used, then the names of the statements must be quoted, e.g.:

`def(tr$tip.label, "^Pan_" = "red", regexp = TRUE)`

will return "red" for all labels starting with "Pan_".

### Value

a vector of the same length than `x`.

### Author(s)

Emmanuel Paradis

### Examples

    data(bird.orders)
    a <- def(bird.orders$tip.label, Galliformes = 2)
    str(a) # numeric
    plot(bird.orders, font = a)
    co <- def(bird.orders$tip.label, Passeriformes = "red", Trogoniformes = "blue")
    str(co) # character
    plot(bird.orders, tip.color = co)
    ### use of a regexp (so we need to quote it) to colour all orders
    ### with names starting with "C" (and change the default):
    co2 <- def(bird.orders$tip.label, "^C" = "gold", default = "grey", regexp = TRUE)
    plot(bird.orders, tip.color = co2)

[Package ape version 4.1 Index]