Select default number of components for a CLAMP solver SVD

Returns the default number of components to compute in a truncated SVD for the given input matrix. Used by the CLAMP solvers when svd_k is not provided explicitly. Other SVD contexts use their own heuristics.

select_svd_k(Y)

Arguments

Y

A matrix-like object (dense matrix, dgCMatrix, or FBM).

Value

An integer: max(2, floor((min(nrow(Y), ncol(Y)) - 1) / 4)).

Examples

select_svd_k(matrix(0, nrow = 100, ncol = 20))
#> [1] 4