nlme (version 3.1-163)

solve.pdMat: Calculate Inverse of a Positive-Definite Matrix

Description

The positive-definite matrix represented by a is inverted and assigned to a.

Usage

# S3 method for pdMat
solve(a, b, ...)

Value

a pdMat object similar to a, but with coefficients corresponding to the inverse of the positive-definite matrix represented by a.

Arguments

a

an object inheriting from class "pdMat", representing a positive definite matrix.

b

this argument is only included for consistency with the generic function and is not used in this method function.

...

some methods for this generic require additional arguments. None are used in this method.

Author

José Pinheiro and Douglas Bates

See Also

pdMat

Examples

pd1 <- pdCompSymm(3 * diag(3) + 1)
solve(pd1)