R/utils.R

In anandhupresannan/biostrings: Efficient manipulation of biological strings

###
### We register the old-style (a.k.a. S3) class below as a formally defined
### class (a.k.a. S4) because we are using it in some method signatures.
### Note that dispatch still works without this registration but causes
### 'R CMD INSTALL' to (gently) complain.
###

setOldClass("probetable")


###
### Some low-level (not exported) helper functions.
###

isNumericOrNAs <- function(x)
{
    is.numeric(x) || (is.atomic(x) && is.vector(x) && all(is.na(x)))
}

normargUseNames <- function(use.names)
{
    if (is.null(use.names))
        return(TRUE)
    if (!isTRUEorFALSE(use.names))
        stop("'use.names' must be TRUE or FALSE")
    use.names
}

### Returns an integer vector.
pow.int <- function(x, y)
{
    if (!is.numeric(x))
        stop("'x' must be a numeric vector")
    if (!is.integer(x))
        x <- as.integer(x)
    ans <- rep.int(1L, length(x))
    for (i in seq_len(y))
        ans <- ans * x
    ans
}