grepVecAnno <- function(x,y,anno) {
# ----------------------------------------
# grep a vector x from a vector y using annotation file
# Input :
# - x : a vector
# - y : a vector
# - anno : an annotation matrix which links x and y. The first and second column includes elements for x and y, respectively.
# Output: a list which includes positions of x in y
# Note : anno file is not necessarily one to one, multiple positions are possible for an element of x
# ----------------------------------------
stopifnot(is.matrix(anno),length(x)>0,length(y)>0)
w.anno = grepVec(x,anno[,1],exact=T,Union=F)
sapply(1:length(x),function(i) grepVec(anno[w.anno[[i]],2],y,exact=T,Union=T),simplify=F)
}
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