Unexpected behavior of !

[Dennis Fisher <fisher@plessthan.com>]

Colleagues:

In S-Plus 8.0.4 (Linux), the command:

!is.R()

yields the following response:

Badly placed ()'s.

If I enter: 

{ !is.R() }

I get the desired response:

[1] T

If I enter:

is.R()

I also get the desired response:

[1] F

Can anyone explain why I need {} ?

Dennis

Dennis Fisher MD

P < (The "P Less Than" Company)

Phone: 1-866-PLessThan (1-866-753-7784)

Fax: 1-415-564-2220

www.PLessThan.com