This is a modified version of cmdscale that uses the Lanczos procedure (slanczos) instead of eigen. Called by smooth.construct.pco.smooth.spec.
cmdscale_lanczos(d, k = 2, eig = FALSE, add = FALSE, x.ret = FALSE)a distance structure as returned by dist, or a full symmetric matrix of distances or dissimilarities.
the maximum dimension of the space which the data are to be represented in; must be in {1, 2, ..., n-1}.
logical indicating whether eigenvalues should be returned.
logical indicating if the additive constant of Cailliez (1983) should be computed, and added to the non-diagonal dissimilarities such that the modified dissimilarities are Euclidean.
indicates whether the doubly centred symmetric distance matrix should be returned.
as cmdscale
Cailliez, F. (1983). The analytical solution of the additive constant problem. Psychometrika, 48, 343-349.