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rstringdplyrformula

Convert a string vector into a formula style, removing **""*

I want to convert the following string vector:

variables <- c("temperature", "rain", "sun_days", "season")

into the following formula:

formula <- pred ~ treatment*(temperature + rain + sun_days + season)

The way I converted the variables vector into a formula style is the following:

predictors <- paste0(variables, collapse = "+")

However, it does not make the trick when I write the formula in the following way:

formula <- pred ~ treatment*(variables)

It doesn't work because of the "" that characterises the string vector.

Any idea?

Solution 
  • formula <- as.formula(
  paste("pred ~ treatment * (", paste(variables, collapse = "+"), ")")
)

    Result:

    > formula
pred ~ treatment * (temperature + rain + sun_days + season)