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#' Calculate medians of columns
#' @param x a matrix
colMedians = function(x){
apply(x, 2, median, na.rm=T)
}
#' Calculate standard deviations of columns
#' @param x a matrix
colSds = function(x){
apply(x, 2, sd, na.rm=T)
}
#' Divide each row of a matrix with a vector
#'
#' @param m matrix to be divided
#' @param v the vector to use for division
divideRows = function(m, v){
t(apply(m, 1, function(x) x/v))
}
#' Convert DNAStringSet to list of DNAString objects
#'
#' as.list doesn't seem to always work for DNAStringSets, so
#' implementing this ourselves.
#'
#' @param x an object of class DNAStringSet
DNAStringSetToList = function(x){
res = list()
for(i in 1:length(x)){
res[[i]] = x[[i]]
}
return(res)
}
#' Concatenata DNA sequences into a single character object
#'
#' @param sequences either a list of DNAString objects, or a DNAStringSet
#' @return a single character string
concatenateSequences = function(sequences){
if(is.list(sequences)){
paste(unlist(sapply(sequences, toString)), collapse="")
} else{
paste(sequences, collapse="")
}
}
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