This function reads in a Tucson (decadal) format file of tree-ring chronologies (.crn).
read.crn(fname, header = NULL, encoding = getOption("encoding"),
long = TRUE)a character vector giving the file name of the
crn file.
logical flag indicating whether the file has a
header. If NULL then the function will attempt to determine
if a header exists
the name of the encoding to be used when reading the
crn file. Usually the default value will work, but a crn file
written in a non-default encoding may crash the function. In that
case, identifying the encoding and specifying it here should fix the
problem. Examples of popular encodings available on many systems
are "ASCII", "UTF-8", and "latin1" alias
"ISO-8859-1". See the help of file.
logical flag indicating whether to automatically
detect when an input file uses more than 4 characters for the decade.
If FALSE, the function assumes 6 characters are used for the
site ID and 4 characters for the decade, which is the
standard. If TRUE (the default), long records may work.
A data.frame with each chronology in columns and the years as
rows. The chronology IDs are the column names and the years
are the row names. If the file includes sample depth that is included
as the last column (samp.depth). The output class is
class "crn" and "data.frame"
This reads in a standard crn file as defined according to the standards of the ITRDB at http://www1.ncdc.noaa.gov/pub/data/paleo/treering/treeinfo.txt. Despite the standards at the ITRDB, this occasionally fails due to formatting problems.