```
# takes the raw climate data as argument and checks for formatting:
# a) 4 column style as originally supported
# b) dendroclim style (12 months in one row)
# c) a list of b
climdispatch <- function(x) {
## is it a list?
if (any(class(x) == "list")) {
## handle list case
n <- length(x)
minyrs <- maxyrs <- numeric(n)
for (i in 1:n) { # loop through list
# members, and get min and max
# years for later reformatting.
y <- x[[i]] # shortcut for current list
# member
if (dim(y)[2] == 13) { # explanation see non-list
# case.
if (!any(y[,1] == seq(y[1,1], y[dim(y)[1],1], 1))) {
stop("One member in the list supplied as climate data is not properly formatted. see '?dcc' for possible data formats.")
} else {
minyrs[i] <- min(y[,1])
maxyrs[i] <- max(y[,1])
}
}
}
yrs <- max(minyrs):min(maxyrs)
nyrs <- length(yrs)
output.matrix <- matrix(NA, ncol = n + 2, nrow = nyrs*12)
output.matrix[,1] <- rep(yrs, each = 12)
output.matrix[,2] <- rep(1:12, nyrs)
for (i in 1:n) { # loop through list again, and
# put everything in place in
# the new output matrix
y <- x[[i]] # shortcut for current list
# member
for (j in 1:nyrs) {
if (any(y[,1] == yrs[j])) { # check, if currently selected
# year is present in current
# list member
output.matrix[which(output.matrix[,1] == yrs[j]), 2+i] <-
unlist(y[which(y[,1] == yrs[j]), 2:13]) # write elements
# of specific line into i+2 th
# row of output.matrix
} # don't need else-case, as
# matrix is already filled
# with NA
}
}
} else {
## handle non-list case
if (dim(x)[2] == 13) { # should have 12 months
# columns and one year column
if (!any(x[,1] == seq(x[1,1], x[dim(x)[1],1], 1))) { # check
# if the first column is
# perfect sequence of integer
# years. if expression
# evaluates to FALSE, then
# this is the case, if TRUE:
# stop.
stop("unknown format of climate data")
} else { # this is most probably a
# dendroclim-formatted set of
# climate data
yrs <- unique(x[,1])
nyrs <- length(yrs)
output.matrix <- matrix(NA, ncol = 3, nrow = nyrs*12)
output.matrix[,1] <- rep(yrs, each = 12)
output.matrix[,2] <- rep(1:12, nyrs)
for (i in 1:nyrs) { # loop through years and write
# respective rows in
# respective columns in
# output.matrix
output.matrix[which(output.matrix[,1] == yrs[i]), 3] <-
unlist(x[which(x[,1] == yrs[i]), 2:13])
}
}
} else { # could still be the
# originally intended format
# of data.
if (!any(x[,1] == rep(x[1,1]:x[dim(x)[1],1], each = 12))) {
# check if the first column is
# a perfect sequence of
# integer years, each repeated
# 12 times. if expression
# evaluates to FALSE, then
# this is the case, else stop.
stop("unknown format of climate data")
} else {
if (!(any(x[,2] == rep(1:12, length(unique(x[,1])))))) {
# check if the second column
# is perfect sequence of 1:12
# as often as there are
# individual years in column
# 1. if expression evaluates
# to FALSE, then this is the
# case, else stop.
stop("unknown format of climate data")
} else {
output.matrix <- x # pass data directly on to
# pmat
}
}
}
}
output.matrix
}
```

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