Jacobian of string-math

Given a named character array of math expressions and a vector of independent variables, this function calculates the Jacobian matrix of the math expressions with respect to the variables.

Usage

yJacobian(f, x)

Arguments

f

a character vector of length n

x

a character vector of length m

Value

a character matrix (n×m) with derivatives df[i]/dx[j]

Examples

f <- c("2*x*y","exp(-k*x)")
x <- c("x","y")
J <- yJacobian(f,x)
print(J)
#>      [,1]           [,2] 
#> [1,] "2*y"          "2*x"
#> [2,] "-k*exp(-k*x)" "0"