omxsetparameters

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1) Usage

Very handy function to modify the attributes of matrix cells in a model.

omxSetParameters(model, labels, free = NULL, values = NULL, newlabels = NULL, lbound = NULL, ubound = NULL, indep = FALSE)

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2) Arguments

model - a MxModel object. labels - a character vector of target parameter names. free - a boolean vector of parameter free/fixed designations. values - a numeric vector of parameter values. newlabels - a character vector of new parameter names. lbound - a numeric vector of lower bound values. ubound - a numeric vector of upper bound values. indep - boolean. set parameters in independent submodels.Back to top

3) Examples

	A  <- mxMatrix('Full', nrow=3, ncol=3, labels = c('a','b', NA), free = TRUE, name = 'A') 
        # labels for row 1 and 2, row 3 left unalabelled
	model <- mxModel(A, name = 'model')

	model@matrices$A@labels
	     [,1] [,2] [,3]
	[1,] "a"  "a"  "a" 
	[2,] "b"  "b"  "b" 
	[3,] NA   NA   NA  

	model <- omxSetParameters(model, c('a', 'b'), values = c(1, 2)) # set value of cells labelled "a" and "b" to 1 and 2 respectively
	model <- omxSetParameters(model, c('a', 'b'), newlabels = c('b', 'a')) # set label of cell labelled "a" to "b" and vice versa
	
	# See the results...

	model@matrices$A
	@labels
	     [,1] [,2] [,3]
	[1,] "b"  "b"  "b" 
	[2,] "a"  "a"  "a" 
	[3,] NA   NA   NA  

	@values
	     [,1] [,2] [,3]
	[1,]    1    1    1
	[2,]    2    2    2
	[3,]    0    0    0

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4) Gotchas

This function cannot modify parameters that have NA labels (i,e, label your matrix cells if you want to use this to set and drop parameters.

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5) See Also

omxGetParameters, omxAssignFirstParameters mxRename

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