The goal of formulops is to assist with formula modification in R treating formulae as standard mathematical operations as used with nlme::nlme() and lme4::nlmer() (for treatment as statistical formula see the Formula package).
You can install the released version of formulops from CRAN with:
install.packages("formulops")
A few common examples of modifying a formula are given below.
library(formulops) # Replace a with c in the formula modify_formula(a~b, find=quote(a), replace=quote(c)) # Replace a with c+d in the formula modify_formula(a~b, find=quote(a), replace=quote(c+d)) # More complex parts can be replaced, too modify_formula(a~b/c, find=quote(b/c), replace=quote(d)) # Multiple replacements can occur simultaneously modify_formula(a~b/c+d, find=list(quote(b/c), quote(d)), replace=list(quote(d), quote(e))) # Function arguments can be expanded modify_formula(a~b(c), find=quote(c), replace=quote(formulops_expand(d, e)))
A substituting formula is a simple way to generate a complex formula from several simpler formulae. Parentheses are appropriately added, if required.
foo <- substituting_formula(y~x1+x2, x1~x3*x4, x2~x5/x6+x7) as.formula(foo)
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4