lcSuffix {Biobase} | R Documentation

## Compute the longest common prefix or suffix of a string

### Description

These functions find the longest common prefix or suffix among the strings in a character vector.

### Usage

    lcPrefix(x, ignore.case=FALSE)
    lcPrefixC(x, ignore.case=FALSE)
    lcSuffix(x, ignore.case=FALSE)

### Arguments

`x` | a character vector.
`ignore.case` | A logical value indicating whether or not to ignore the case in making comparisons.

### Details

Computing the longest common suffix is helpful for truncating names of objects, like microarrays, that often have a common suffix, such as .CEL.

There are some potential problems with the approach used if multibyte character encodings are being used.

`lcPrefixC` is a faster implementation in C. It only handles ascii characters.

### Value

The common prefix or suffix.

### Author(s)

R. Gentleman

### See Also

`nchar`, `nchar`

### Examples

    s1 <- c("ABC.CEL", "DEF.CEL")
    lcSuffix(s1)

    s2 <- c("ABC.123", "ABC.456")
    lcPrefix(s2)

    CHK <- stopifnot

    CHK(".CEL" == lcSuffix(s1))
    CHK("bc" == lcSuffix(c("abc", "333abc", "bc")))
    CHK("c" == lcSuffix(c("c", "abc", "xxxc")))
    CHK("" == lcSuffix(c("c", "abc", "xxx")))

    CHK("ABC." == lcPrefix(s2))
    CHK("ab" == lcPrefix(c("abcd", "abcd123", "ab", "abc", "abc333333")))
    CHK("a" == lcPrefix(c("abcd", "abcd123", "ax")))
    CHK("a" == lcPrefix(c("a", "abcd123", "ax")))
    CHK("" == lcPrefix(c("a", "abc", "xxx")))

    CHK("ab" == lcPrefixC(c("abcd", "abcd123", "ab", "abc", "abc333333")))
    CHK("a" == lcPrefixC(c("abcd", "abcd123", "ax")))
    CHK("a" == lcPrefixC(c("a", "abcd123", "ax")))
    CHK("" == lcPrefixC(c("a", "abc", "xxx")))

[Package Biobase version 2.0.1 Index]