| mxRestore {OpenMx} | R Documentation |
The function loads the last saved state from a checkpoint file.
mxRestore(model, chkpt.directory = ".", chkpt.prefix = "", line=NULL, strict=FALSE)
model |
MxModel object to be loaded. |
chkpt.directory |
character. Directory where the checkpoint file is located. |
chkpt.prefix |
character. Prefix of the checkpoint file. |
line |
integer. Which line from the checkpoint file to restore (defaults to the last line) |
strict |
logical. Require that the checkpoint name and model name match. |
In general, the arguments ‘chkpt.directory’ and ‘chkpt.prefix’ should be identical to the mxOption: ‘Checkpoint Directory’ and ‘Checkpoint Prefix’ that were specificed on the model before execution.
Alternatively, the checkpoint file can be manually loaded as a data.frame in R. Use read.table with the options header=TRUE, sep="\t", stringsAsFactors=FALSE, check.names=FALSE.
Returns an MxModel object with free parameters updated to the last saved values. When ‘line’ is provided, the MxModel is updated to the values on that line within the checkpoint file.
The OpenMx User's guide can be found at http://openmx.psyc.virginia.edu/documentation.
library(OpenMx) # Simulate some data x=rnorm(1000, mean=0, sd=1) y= 0.5*x + rnorm(1000, mean=0, sd=1) tmpFrame <- data.frame(x, y) tmpNames <- names(tmpFrame) # Create a model that includes an expected covariance matrix, # an expectation function, a fit function, and an observed covariance matrix data <- mxData(cov(tmpFrame), type="cov", numObs = 1000) expCov <- mxMatrix(type="Symm", nrow=2, ncol=2, values=c(.2,.1,.2), free=TRUE, name="expCov") expFunction <- mxExpectationNormal(covariance="expCov", dimnames=tmpNames) fitFunction <- mxFitFunctionML() testModel <- mxModel(model="testModel", expCov, data, expFunction, fitFunction) #Use mxRun to optimize the free parameters in the expected covariance matrix modelOut <- mxRun(testModel, checkpoint = TRUE) modelOut$expCov #Use mxRestore to load the last checkpoint saved state of the model modelRestore <- mxRestore(testModel) modelRestore$expCov