mode() v. class() issues

[droglenc]

Consider changing the class()es returned by iHndlFormula() to mode()s. An example problem occurs with the following where hist.formula() does not recognize the result as numeric because it checks the class (i.e., array) and not the mode (i.e., numeric).

res <- combn(2:9,2,mean)
hist(~res,w=0.5)

[droglenc]

Modified iHndlFormula() for the single variable case where an array was sent. This addresses this simple example.