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mxAlgebra(expression, name = NA, dimnames = NA)

mxAlgebra() allows you create algebraic expressions based on one or more MxMatrix objects.

Legal functions within an algebra are described here [2].

A <- mxMatrix("Full", nrow = 3, ncol = 3, values=1:9, name = "A") B <- mxAlgebra(A, name = "B") C <- mxAlgebra(A + B, name = "C") D <- mxAlgebra(sin(C), name = "D") model <- mxModel("AlgebraExample", A, B, C, D ) fit <- mxRun(model) mxEval(AlgebraExample.D, fit) # [,1] [,2] [,3] # [1,] 0.9092974 0.9893582 0.9906074 # [2,] -0.7568025 -0.5440211 -0.2879033 # [3,] -0.2794155 -0.5365729 -0.7509872

A common misunderstanding is to call mxAlgebra() expecting it to be evaluated without subsequently being placed in a model and run as above. To evaluate an MxAlgebra, it must be placed in an MxModel (along with all referenced MxMatrix objects) and run.

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**Links**

[1] https://openmx.ssri.psu.edu/wiki/main-page

[2] https://openmx.ssri.psu.edu/wiki/matrix-operators-and-functions