x <- matrix(c("a", "2", "4", "c", "d", "6"), 3, 2)
x
#> [,1] [,2]
#> [1,] "a" "c"
#> [2,] "2" "d"
#> [3,] "4" "6"
y <- as.Sym(x)
y
#> Yacas matrix:
#> [,1] [,2]
#> [1,] a c
#> [2,] 2 d
#> [3,] 4 6
Eval(y, list(a = 3, c = 3, d = 3))
#> [,1] [,2]
#> [1,] 3 3
#> [2,] 2 3
#> [3,] 4 6