It changes the syntax of the function by replacing variable names for their scaled form, e.g. x --> x*apollo_inputs$apollo_scale[["x"]]. In assignments, it only scales the right side of the assignment.
apollo_insertScaling(e, sca)
A function, expression, call or symbol with the corresponding variables scaled.
Function, expression, call or symbol to alter.
Named numeric vector with the scales. The names in these vectors determine which variables should be scaled.