Re: [R] Formula with dynamic number of variables

# fixed formula part: f <- dat ~ a0 * exp(-S*(x - 250)) + K # convert to character f <- as.character(f) # component: C <- "(p0*exp(-0.5*((x-p1)/p2)^2))" # number of components (defined randomly): n <- sample(1:3, 1) C <- rep(C, n) # collapse: C <- paste(C, collapse = "+") # combine f <- paste(f[2],

[R] Formula with dynamic number of variables

Hi everyone. I have a non-linear model specified as this (6 variables, a0, S, K, p0, p1, p2): fit <- nlsLM(formula = dat ~ a0 * exp(-S*(x - 250)) + K + ( C ) ) where C = (p0*exp(-0.5*((x-p1)/p2)^2)) The problem is that I do not know in advance how many component (C) I will have in the model. T