inst/models/passing/UselessConstraint.R

In OpenMx/OpenMx: Extended Structural Equation Modelling

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# http://openmx.ssri.psu.edu/issue/2014/05/memory-leak-when-running-ram-model-constraint

library(OpenMx)

#mxOption(NULL, "Default optimizer", 'SLSQP')

data(demoOneFactor)
manifests <- names(demoOneFactor)
latents <- c("G")
factorModelPath <- mxModel(
	"OneFactorPath",
	type="RAM",
	manifestVars = manifests,
	latentVars = latents,
	mxPath(from=latents, to=manifests,
				 labels=paste("l",1:5,sep="")),
	mxPath(from=manifests, arrows=2),
	mxPath(from=latents, arrows=2,
				 free=FALSE, values=1.0),
	mxData(cov(demoOneFactor), type="cov",
				 numObs=500),
	mxAlgebra(S[6,6],name="GV"),
	mxConstraint(GV-1==0,name="pointless"),
	mxConstraint(GV>0,name="morePointless"))
#factorModelPath <- mxOption(factorModelPath,"Checkpoint Directory","C:/Work/OpenMx_dev/")
#factorModelPath <- mxOption(factorModelPath,"Checkpoint Units","evaluations")
#factorModelPath <- mxOption(factorModelPath,"Checkpoint Count",1)
factorModelPath <- mxOption(factorModelPath,"Calculate Hessian","No")
factorModelPath <- mxOption(factorModelPath,"Standard Errors","No")
factorFit <- mxRun(factorModelPath, silent = TRUE)

omxCheckEquals(factorFit$output$status$code, 0)

if (mxOption(NULL, "Default optimizer") != 'NPSOL') {
	# Any constraints that show up here by mistake will have a zero gradient.
	omxCheckTrue(all(factorFit$output$gradient != 0))
  omxCheckCloseEnough(sqrt(sum(factorFit$output$gradient^2)), 0, .08)
}