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#########################################################################/**
# @RdocDefault insert
#
# @title "Insert values to a vector at certain positions"
#
# \description{
# @get "title".
# }
#
# @synopsis
#
# \arguments{
# \item{x}{The @vector of data values.}
# \item{ats}{The indices of \code{x} where the values should be inserted.}
# \item{values}{A @list or a @vector of the values to be inserted.
# Should be of same length as \code{ats}, unless if a single value
# when it is automatically extended without a warning.}
# \item{useNames}{If @FALSE, the names attribute is dropped/ignored,
# otherwise not. Only applied if argument \code{x} is named.}
# \item{...}{Not used.}
# }
#
# @examples "../incl/insert.Rex"
#
# \seealso{
# @see "base::append" takes argument \code{after} (a scalar). For example,
# \code{append(x, y, after=after) == insert(x, values=y, ats=after+1)}.
# Contrary to \code{append()}, \code{insert()} accepts a vector of insert indices.
# }
#
# @author
#
# @keyword "manip"
#*/#########################################################################t
setMethodS3("insert", "default", function(x, ats, values=NA, useNames=TRUE, ...) {
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Local functions
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# For debug only!
## printFromTo <- function(from, to, x) {
## fromto <- matrix(c(from, to), ncol=2);
## colnames(fromto) <- c("from", "to");
## idx <- apply(fromto, MARGIN=1, FUN=function(i) seqToHumanReadable(i[1]:i[2]));
## xidx <- apply(fromto, MARGIN=1, FUN=function(i) paste(x[i[1]:i[2]], collapse=","));
## print(data.frame(from=from, to=to, idx=idx, x.=xidx))
## }
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Validate arguments
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
if (!is.vector(x))
throw("Argument 'x' is not a vector: ", class(x));
len <- length(x);
if (any(ats < 1 | ats > len+1))
throw("Argument 'ats' contains indices out of range: ", paste(ats, collapse=", "));
if (any(duplicated(ats)))
throw("Argument 'ats' contains duplicated indices: ", paste(ats, collapse=", "));
if (!is.vector(values))
throw("Argument 'values' is not a vector: ", class(values));
# Argument 'useNames':
useNames <- as.logical(useNames);
# Deal with the names attribute too?
if (useNames) {
names <- names(x);
useNames <- (!is.null(names));
}
if (!is.list(values)) {
if (length(ats) == 1) {
values <- list(values);
} else {
values <- as.list(values);
}
}
if (length(ats) != length(values)) {
if (length(values) == 1) {
values <- rep(values, length.out=length(ats));
} else {
throw("Argument 'ats' and argument 'values' has different lengths: ",
length(ats), " != ", length(values));
}
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Setup
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Sort the 'ats' indicies
o <- order(ats);
ats <- ats[o];
values <- values[o];
nvalues <- unlist(lapply(values, FUN=length));
# Allocate the result vector
n2 <- length(x) + sum(nvalues);
x2 <- vector(mode=mode(x), length=n2);
storage.mode(x2) <- storage.mode(x);
if (useNames)
names2 <- character(n2);
# 'ats' positions in the result vector
n <- length(ats);
ats2 <- ats + c(0, cumsum(nvalues[-n]));
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Assign inserted values
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
for (kk in 1:length(ats2)) {
idx2 <- ats2[kk] + 0:(nvalues[kk]-1);
valuesKK <- values[[kk]];
x2[idx2] <- valuesKK;
if (useNames) {
valueNames <- names(valuesKK);
if (is.null(valueNames))
valueNames <- character(length(valuesKK));
names2[idx2] <- valueNames;
}
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Assign original values
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
froms <- c(1, ats);
tos <- c(ats-1, length(x));
froms2 <- c(1, ats2+nvalues);
if (ats[1] == 1) {
froms <- froms[-1];
tos <- tos[-1];
froms2 <- froms2[-1];
}
if (ats[n] > length(x)) {
froms <- froms[-length(froms)];
tos <- tos[-length(tos)];
froms2 <- froms2[-length(froms2)];
}
ns <- tos-froms+1;
tos2 <- froms2 + ns - 1;
for (kk in seq_along(froms2)) {
from <- froms[kk];
to <- tos[kk];
from2 <- froms2[kk];
to2 <- tos2[kk];
idx <- from:to;
idx2 <- from2:to2;
x2[idx2] <- x[idx];
if (useNames)
names2[idx2] <- names[idx];
}
if (useNames)
names(x2) <- names2;
x2;
})
############################################################################
# HISTORY:
# 2012-09-21
# o Now insert() silently expands 'values' to be of the same length
# as 'ats', iff length(values) == 1.
# 2008-12-27
# o Added argument 'useNames' to insert(), which is now aware of names
# of the input object.
# 2008-03-31
# o BUG FIX: If 'x' in insert(x, ...) was zero length, an "Error in from:to
# : NA/NaN argument" was thrown.
# 2008-02-21
# o BUG FIX: When 'values' was a non-list its values were placed in a
# single-element list. Should have been as.list().
# 2005-06-12
# o Updated a lot! Wrote a rather large example.
# 2005-02-20
# o Now using setMethodS3() and added '...' to please R CMD check.
# 2001-11-24
# o Created.
############################################################################
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