r - Why are = and <- not equivalent in within()? - 


> within( list(a="a",b="b"), c="c" ) error in eval(expr, envir, enclos) : argument missing, no default > within( list(a="a",b="b"), c<-"c" ) $a [1] "a"  $b [1] "b"  $c [1] "c"

i'm not sure why these 2 shouldn't equivalent. seems the = version getting interpreted argument named c within because of .... there way disable behavior? tried,

within( list(a="a",b="b"), `c`="c" )

but fails too.

you correct c="c" (or clause of form) getting interpreted supplied argument. , no, there's no way disable -- it's presumably handled down @ level of r parser.

this difference between = , <- documented ?"<-"

the operators ‘<-’ , ‘=’ assign environment in evaluated. operator ‘<-’ can used anywhere, whereas operator ‘=’ allowed @ top level (e.g., in complete expression typed @ command prompt) or 1 of subexpressions in braced list of expressions.

the prime example of "braced list of expressions" function body, can verify typing, e.g. is(body(plot.default)), length(body(plot.default)).


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