[R] Fortune candidate! Re: Why can't R understand if(num!=NA)?

[Sarah Goslee]

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
>