Read multiple *.nts files, each containing landmark coordinates for a single specimen
readmulti.nts(filelist)a character vector of file names for the *.nts files to be read in
Function returns a 3D array (p x k x n), where p is the number of landmark points, k is the number of landmark dimensions (2 or 3), and n is the number of specimens. The third dimension of this array contains names for each specimen, which are obtained from the file names.
Function reads a character vector of filenames for a set of *.nts files that each contain two- or
three-dimensional landmark coordinates for a single specimen (e.g., exported from digit.fixed and digitsurface).
This is for NTS files of the "single specimen format" (details below), which is not the same as readland.nts.
NTS files are text files in one of the standard formats for geometric morphometrics (see Rohlf 2012).
Single specimen format:
The parameter line contains 5 or 6 elements, and must begin with a "1" to designate a rectangular matrix.
The second and third values designate how many landmarks (p) and the dimensions (k) of the data matrix.
The fourth value is a "0" if the data matrix is complete and a "1"
if there are missing values. If missing values are present, the '1' is followed by the arbitrary
numeric code used to represent missing values (e.g., -999). These values will be replaced with "NA"
in the output array. Subsequent analyses requires a full complement of data, see estimate.missing.
Missing data may be present in the file by designating them using 'NA'. In this case, the standard NTSYS header is used with no numeric designation for missing data (i.e. the fourth value is '0'). The positions of missing landmarks may then be estimated using estimate.missing.
Rohlf, F. J. 2012 NTSYSpc: Numerical taxonomy and multivariate analysis system. Version 2.2. Exeter Software, New York.