[R] Compare matrices

[Rolf Turner]

On 20/01/2009, at 10:05 AM, David Winsemius (who should know better)  
wrote:

	<snip>

> B[which(B == FALSE)] <- NA

	<snip>

This sort of syntax drives me, and all right-thinking people,  
subclinically neurotic
(or as a psychiatrist would say, stark staring bonkers).

Admittedly it's not (quite) as bad as using ``Y==TRUE'' where ``Y''
is what is wanted, but it's pretty bad.

One should say ``B[!B] <- NA''.

	cheers,

		Rolf Turner

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