rxExpandGrid_: Expand grid internal function
Description
Expand grid internal function
Usage
rxExpandGrid_(c1, c2, type)
Arguments
c1
character vector of items to be expanded
c2
second character vector of items to be expanded
type
0 for a typical data frame, 1 for symengine sensitivity expansion
Value
data frame (when type = 0) or symengine string (when type=1)