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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)

**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. |

A <- mxMatrix('Full', nrow=3, ncol=3, labels = c('a','b', NA), free = TRUE, name = 'A') <em># labels for row 1 and 2, row 3 left unalabelled</em> model <- mxModel(A, name = 'model') model@matrices$A@labels [,1] [,2] [,3] [1,] "a" "a" "a" [2,] "b" "b" "b" [3,] NA NA NA model <- omxSetParameters(model, c('a', 'b'), values = c(1, 2)) <em># set value of cells labelled "a" and "b" to 1 and 2 respectively</em> model <- omxSetParameters(model, c('a', 'b'), newlabels = c('b', 'a')) <em># set label of cell labelled "a" to "b" and vice versa</em> <em># See the results...</em> model@matrices$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

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.

omxGetParameters, omxAssignFirstParameters

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