Revision of mxModel Help from Fri, 10/28/2011 - 11:25

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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 why you must use the name of the entity instead of the entity itself. The following code WILL NOT WORK and is not allowed to work because "container.A" and "submodel.A" are identical objects. Both objects contain the value "A" in the slot "name."

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" instead of "submodel.A"</em>
accident <- mxModel(container, submodel1$A, remove = TRUE)

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