grapes-twiddle-grapes: %~%
In Ottawa-EPRI/EPmisc: Misc programming convenience, model and output functions

Description Usage Arguments Value Examples

Model update operator. It functions in place of the model update function. In the context of in this part of the formula<e2><80><99>.

1	original_formula %~% addition

`original_formula`	the original formula to use.
`addition`	Additions / removals / changes to the formula.

Updated formula.

## Add Sepal.Width to model2.
model <- setosa ~ Sepal.Length
## Add Sepal.Width to the existing model.
model2 <- model %~% ~ . + Sepal.Width
## Note the brackets are necessary in case of LHS substitution, otherwise
## the whole formula is consumed without evaluation.
model3 <- model %~% (Sepal.Width ~ .)