The utility function dist_pairs_map computes the distance between all
possible pairs of fatty acid signatures within each type of prey or predator.
dist_pairs_map(sig_data, dist_meas = 1, gamma = 1)A numeric matrix of fatty acid signatures in column-major format.
An integer indicator of the distance measure to compute. Default value 1.
The power parameter of the chi-square distance measure. Default value 1.
A list containing the following elements:
The number of signatures (columns) in sig_data.
The column of sig_data containing one signature.
The column of sig_data containing the other
signature.
The distance between signatures sig_1 and sig_2.
This is an internal utility function. The signature data in sig_data
are presumed to be ready for analysis, which is best accomplished by a call
to the function prep_sig. Consequently, to increase execution
speed during simulations, no numeric error checking is performed. Please
refer to the documentation for prep_sig for additional
information.
Please refer to the documentation for dist_between_2_sigs for
additional information regarding distance measures.
Storing the distances between all possible pairs of fatty acid signatures along with the locations of each pair requires less memory than a square matrix of all possible pairs, while allowing the location of the signatures to be easily determined.
Utility functions called by dist_sigs_2_mean: