Fortune candidate! Re: Why can't R understand if(num!=NA)?
On Fri, May 3, 2013 at 3:36 PM, David Winsemius <dwinsemius at comcast.net> wrote:
On May 3, 2013, at 17:24 , jpm miao wrote:
I have a program, when I write if(num!=NA)
snipped
On May 3, 2013, at 10:46 AM, peter dalgaard wrote:
Because comparison with an unknown value yields an unknown result.
Anything else would violate the Second Law of Thermodynamics. We cannot have comparisons reducing entropy, now can we? Uncertainty cannot run uphill. -- David Winsemius Alameda, CA, USA