On Fri, May 3, 2013 at 3:36 PM, David Winsemius <dwinsem...@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 >
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