dist.xyz: Calculate the Distances Between the Rows of Two Matrices
Description
Compute the pairwise euclidean distances between the rows of two matrices.
Usage
dist.xyz(a, b = NULL, all.pairs=TRUE, ncore=1, nseg.scale=1)
Arguments
a
a numeric data matrix of vector
b
an optional second data matrix or vector
all.pairs
logical, if TRUE all pairwise distances between the
rows of a and all rows of b are computed, if FALSE
only the distances between coresponding rows of a and
b are computed.
ncore
number of CPU cores used to do the calculation.
ncore>1 requires package parallel installed.
nseg.scale
split input data into specified number of segments
prior to running multiple core calculation. See fit.xyz.
Value
Returns a matrix of pairwise euclidean distances between each row of
a and all rows of b.
Details
This function returns a matrix of euclidean distances between each row
of a and all rows of b. Input vectors are
coerced to three dimensional matrices (representing the Cartesian
coordinates x, y and z) prior to distance computation. If b is
not provided then the pairwise distances between all rows of a
are computed.
References
Grant, B.J. et al. (2006) Bioinformatics22, 2695--2696.