Arguments
file
character: path to file containing landmark data.
x
either a vector specifiing which rows are to be imported, or
character vector containing variable names to be sought for.
y
a vector specifiing, which columns of the speradsheet ist to be
imported.
rownames
integer: specifies columns, where variable names are stored.
header
logical : if spreadsheet contains header-row.
dec
character: defines decimal sepearator.
sep
character: defines column seperator.