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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)


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.


    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')

         [,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...

         [,1] [,2] [,3]
    [1,] "b"  "b"  "b" 
    [2,] "a"  "a"  "a" 
    [3,] NA   NA   NA  

         [,1] [,2] [,3]
    [1,]    1    1    1
    [2,]    2    2    2
    [3,]    0    0    0


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.

See Also


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