R: Check Start of Character String

begins {spatstat} | R Documentation

## Check Start of Character String

### Description

Checks whether a character string begins with a particular prefix.

### Usage

    begins(x, firstbit)

### Arguments

`x` | Character string, or vector of character strings, to be tested.
`firstbit` | A single character string.

### Details

This simple wrapper function checks whether (each entry in) `x` begins with the string `firstbit`, and returns a logical value or logical vector with one entry for each entry of `x`. This function is useful mainly for reducing complexity in model formulae.

### Value

Logical vector of the same length as `x`.

### Author(s)

Adrian Baddeley Adrian.Baddeley@curtin.edu.au

Rolf Turner r.turner@auckland.ac.nz

and Ege Rubak rubak@math.aau.dk

### Examples

      begins(c("Hello", "Goodbye"), "Hell")
      begins("anything", "")

[Package spatstat version 1.63-3 Index]