needUpdate.modelStruct {nlme} | R Documentation

## Check if a modelStruct Object Needs Updating

### Description

This method function checks if any of the elements of `object` needs to be updated. Updating of objects usually takes place in iterative algorithms in which auxiliary quantities associated with the object, and not being optimized over, may change.

### Usage

    ## S3 method for class 'modelStruct':
    needUpdate(object)

### Arguments

`object` | an object inheriting from class `modelStruct`, representing a list of model components, such as `corStruct` and `varFunc` objects.

### Value

a logical value indicating whether any element of `object` needs to be updated.

### Author(s)

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

### Examples

    lms1 <- lmeStruct(reStruct = reStruct(pdDiag(diag(2), ~age)),
       varStruct = varPower(form = ~age))
    needUpdate(lms1)

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