Table of Contents

omxAssignFirstParameters(model, indep=F)

Arguments

model a MxModel object.

indep assign parameters to independent submodels.

Sometimes you may have a free parameter with two different starting values in your model, and it may be sufficient to arbitrarily select one of those starting values for optimization. OpenMx will not run a model until all instances of a free parameter have the same starting value. This function will assign starting values to the free parameters of a model. It will select an arbitrary current value (the "first" value it finds, where "first" is not defined) for each free parameter and use that value.

require(OpenMx) A <- mxMatrix('Full', 3, 3, values = c(1:9), labels = c('a','b', NA), free = T, name = 'A') A # @labels # [,1] [,2] [,3] # [1,] "a" "a" "a" # [2,] "b" "b" "b" # [3,] NA NA NA # @values # [,1] [,2] [,3] # [1,] 1 4 7 # [2,] 2 5 8 # [3,] 3 6 9 model <- mxModel(A, name = 'model') model <- omxAssignFirstParameters(model) # Note that all cells with the same label now have the same start value. model@matrices$A # @labels # [,1] [,2] [,3] # [1,] "a" "a" "a" # [2,] "b" "b" "b" # [3,] NA NA NA # # @values # [,1] [,2] [,3] # [1,] 1 1 1 # [2,] 2 2 2 # [3,] 3 6 9

omxGetParameters, omxSetParameters

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