rank — Rank of a Matrix
rank calculates the rank of the argument matrix. The rank
of a matrix is the number of non-zero singular values of that matrix.
However since numeric computation introduces errors, the singular
values are actually tested against a set tolerance value. The
optional scalar argument, if present, specifies the tolerance,
otherwise the default of the triple-product of the greater dimension of the
argument, the 2-norm of the matrix and machine epsilon is used.
This is not an built-in function. This function
is normally loaded on start-up from the rank.r file in the
standard rlib directory. Use of the -r option, incorrectly
setting the RLAB_LIB_DIR environmental variable, or modifying
rank.r may make this function unavailable.
Subsections