solve.pdMat {nlme} | R Documentation

## 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 class 'pdMat':
    solve(a, b, ...)

### 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.

### Value

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

### Author(s)

Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates bates@stat.wisc.edu

### See Also

`pdMat`

### Examples

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

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