is.formula {ANOFA} | R Documentation |
logical functions for formulas
Description
The functions is.formula()
, is.one.sided()
,
has.nested.terms()
,
has.cbind.terms()
, in.formula()
and sub.formulas()
performs checks or extract sub-formulas from a given formula.
Usage
is.formula(frm)
is.one.sided(frm)
has.nested.terms(frm)
has.cbind.terms(frm)
in.formula(frm, whatsym)
sub.formulas(frm, head)
Arguments
frm |
a formula; |
whatsym |
a symbol to search in the formula; |
head |
the beginning of a sub-formula to extract |
Details
These formulas are for internal use.
Value
is.formula(frm)
, has.nested.terms(frm)
, and has.cbind.terms(frm)
returns TRUE if frm is a formula, contains a '|' or a 'cbind' respectively;
in.formula(frm, whatsym)
returns TRUE if the symbol whatsym
is somewhere in 'frm';
sub.formulas(frm, head)
returns a list of all the sub-formulas which contains head
.
Examples
is.formula( Frequency ~ Intensity * Pitch )
has.nested.terms( Level ~ Factor | Level )
has.cbind.terms( Frequency ~ cbind(Low,Medium,High) * cbind(Soft, Hard) )
in.formula( Frequency ~ Intensity * Pitch, "Pitch" )
sub.formulas( Frequency ~ cbind(Low,Medium,High) * cbind(Soft, Hard), "cbind" )
[Package ANOFA version 0.1.3 Index]