Get body of function as an expression.
Get body of function as an expression.
bodyAsExpression(x)
x |
An R function. |
This function is similar to the R body function except that function
returns a call object whereas this one returns an expression usable in
Ryacas calculations.
An expression.
# construct an R function for the Burr probability density # function (PDF) given the Burr cumulative distribution function (CDF) BurrCDF <- function(x, c = 1, k = 1) 1-(1+x^c)^-k # transfer CDF to yacas yacas(BurrCDF) # create a template for the PDF from the CDF BurrPDF <- BurrCDF # differentiate CDF and place resulting expression in body body(BurrPDF) <- yacas(expression(deriv(BurrCDF(x,c,k))))[[1]] # test out PDF BurrPDF(1)
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