ord.matrix: Give the Order of a Symmetric Matrix or Half Matrix

In anniejw6/metrumrg: Pharmacometric Tools for Data Preparation, Modeling, Simulation, and Reporting

Description

The dimensions of a symmetric matrix are equal; this value is, by definition, the order of the matrix. For class halfmatrix, the order is found using a quadratic expression with length as an argument.

Usage

## S3 method for class 'matrix'
ord(x, ...)
## S3 method for class 'halfmatrix'
ord(x, ...)

Arguments

x	symmetric matrix or halfmatrix
...	extra arguments, ignored

Details

It is an error if x is a matrix but not symmetric. If x is a vector of appropriate length its order can be found by specifying the method explicitly, even if x is not classed as halfmatrix: ord.halfmatrix(x).

Value

scalar numeric

Author(s)

Tim Bergsma

References

http://metrumrg.googlecode.com

See Also

is.square.matrix, isSymmetric.matrix half.matrix

Examples

ord(diag(4))
ord(half(diag(4)))
ord.halfmatrix(1:10)

anniejw6/metrumrg documentation built on May 10, 2019, 11:50 a.m.