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rr-formula

How to make index for R formula?

I am trying to index some components in a R formula such like

var<-c("x1", "x2", "x3")

for (i in var) as.formula(i/x4)

But it always come with an error:

Error in i/x4 : non-numeric argument to binary operator

May somebody know how to make it work? so that out with,

x1/x4, x2/x4, x3/x4
Solution

  • After reading OP's comments, changing answer to OP's needs

    for (i in var) {
        form <-sprintf("~ %s/ x4 ",i)
        deltamethod(as.formula(form),...) #other arguments that you need to supply

    }