is.projector {dae} | R Documentation |
Tests whether an object
is a valid object of class
"projector
".
is.projector(object)
object |
The |
The function is.projector
tests whether the object consists of a
matrix
that is square, symmetric and idempotent. In checking
symmetry and idempotency, the equality of the matrix with either its
transpose or square is tested. In this, a difference in elements is
considered to be zero if it is less than daeTolerance
, which is
initially set to .Machine$double.eps ^ 0.5
(about 1.5E-08).
The function set.daeTolerance
can
be used to change daeTolerance
.
TRUE
or FALSE
depending on whether the object is a valid object of class
"projector
".
The degrees of freedom are not checked. correct.degfree
can be used to check them.
Chris Brien
projector
, correct.degfree
in package dae.
projector
for further information about this class.
## set up a 2 x 2 mean operator that takes the mean of a vector of 2 values
m <- matrix(rep(0.5,4), nrow=2)
## create an object of class projector
proj.m <- projector(m)
## check that it is a valid projector
is.projector(proj.m)