funC0: Evaluation of algebraic expressions defined by characters
In dMod: Dynamic Modeling and Parameter Estimation in ODE Models

Description Usage Arguments Value Examples

Evaluation of algebraic expressions defined by characters

funC0(
  x,
  variables = getSymbols(x, exclude = parameters),
  parameters = NULL,
  compile = FALSE,
  modelname = NULL,
  verbose = FALSE,
  convenient = TRUE,
  warnings = TRUE
)

`x`	Object of class `eqnvec` or a named character vector with the algebraic expressions
`variables`	character vector, the symbols that should be treated as variables
`parameters`	character vector, the symbols that should be treated as parameters
`compile`	Logical. Directly compile the file. If `FALSE` and modelname is available, the C file is written but not compiled. In this case, compile has to be called separately to compile one or more .c-files into one .so-file. If modelname is not available, an R function is generated and returned.
`modelname`	file name of the generated C file. See description of parameter `compile`.
`verbose`	Print compiler output to R command line.
`convenient`	logical, if TRUE return a function with argument `...` to pass all variables/parameters as named arguments
`warnings`	logical. Suppress warnings about missing variables/parameters that are automatically replaced by zero values.

Either a prediction function f(..., attach.input = FALSE) where the variables/parameters are passed as named arguments or a prediction function f(M, p, attach.input = FALSE) where M is the matrix of variable values (colums with colnames correspond to different variables) and p is the vector of parameter values. The argument attach.input determines whether M is attached to the output. The function f returns a matrix.

library(ggplot2)
myfun <- funC0(c(y = "a*x^4 + b*x^2 + c"))
out <- myfun(a = -1, b = 2, c = 3, x = seq(-2, 2, .1), attach.input = TRUE)
qplot(x = x, y = y, data = as.data.frame(out), geom = "line")