Revision of mxModel Help from Wed, 01/05/2011 - 17:59

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Basic Examples

<em># Create an empy model, and place it in an object.</em>
model <- mxModel()

# Create a model named 'firstdraft' with one matrix

model <- mxModel('firstdraft', mxMatrix('Full', nrow = 3, ncol = 3, name = "A"))

# Add other matrices to model 'firstdraft', and rename that model 'finaldraft'

model <- mxModel(model, name= "finaldraft",
                 mxMatrix('Symm', nrow = 3, name = "S"),
                 mxMatrix('Iden', nrow = 3, name = "F"))

# Add data to the model from an existing data frame in object 'data'
data <- data.frame()
model <- mxModel(model, mxData(data, type='raw'))

# View the matrix named "A" in MxModel object 'model'

# View the data associated with MxModel object 'model'

Remove an object from a model

You can remove paths, matrices, algebras, and other objects from a model using mxModel, with the to-be-modified model as its first parameter, and then a comma delimited list of the names of the objects you want to remove, setting remove to TRUE

  aModel <- <strong>mxModel</strong>("aModel", mxMatrix(name="myMatrix", type="Full",nrow=8,ncol=5))
  aMinus <- <strong>mxModel</strong>(aModel,  "myMatrix", remove=<font	color="green">TRUE</font>)

Here is an example that highlights why you must use the name of the entity. The following code WILL NOT WORK.

A <- mxMatrix("Full", 1, 1, name = "A")
submodel1 <- mxModel("submodel1", A)
container <- mxModel("container", submodel1, A)
<em>#Oh oh, this would have deleted countainer$A </em>
accident <- mxModel(container, submodel1$A, remove=TRUE)