Examples of org.renjin.stats.internals.models.Formula

org.renjin.stats.internals.models.Formula

Encapsulates the properties of R model formulae, which consist of three elements:

A response (or dependent) variable
An intercept flag (0=do not fit intercept, 1=fit intercept)
A list of independent variable terms

Within the context of R model formulas, a variable is any valid R expression that can be evaluated within the formula's {@link Environment} (usually adata.frame object). It is often a symbol, like simply {@code x} or {@code y}, but a variable in this context a variable can also be a function of a Symbol, such as {@code log(x)} or any valid R expression, such {@code sqrt(x/y)}.

A term is a combination of one or more variables. This class stores terms in their expanded form: the formula described by {@code y ~ a * b} actually has three terms: {@code a}, {@code b}, and {@code a:b}, where {@code a:b} is an interaction term. See {@link FormulaInterpreter} for more information on the DSL.

This internal class is used by the primitives that manipulate model formulas.

    SEXP expr = tree.getElementAsSEXP(0);
    return expr;
  }
  
  private Formula formula(String response, List<Term> terms) {
    return new Formula(Symbol.get(response), 1, terms);
  }

  private Formula formula(String response, List<Term> terms) {
    return new Formula(Symbol.get(response), 1, terms);
  }
  
  private Formula formula(String response, int intercept, List<Term> terms) {
    return new Formula(Symbol.get(response), intercept, terms);
  }

Related Classes of org.renjin.stats.internals.models.Formula

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