[oclug] KWeather

[Fred Jensen]

On Mar 21, 2005, at 10:31 AM, Stephen M. Webb wrote:

> On 20/03/05 11:29 pm, Jeff 'Alias' East wrote:
>> On Sun, Mar 20, 2005 at 11:11:30PM -0500, Frank Stratton - VE3YY  
>> wrote:
>>> This is a true story!
>>> At one time believe it or not, a computer manufacturer I worked for,  
>>> was
>>> looking into having a piece of memory represent three states, zero,  
>>> one
>>> and not (zero or one). Memory was so expensive when I was first  
>>> around
>>> computers
>>
>>  I was learning about tri-state chips a few years back, and the same
>> thought occured to me.  I called it "Trinary".
>
> Ternary logic is a frequent occurrence in computers.  Some examples:
>
> o  tri-state behaviour of various devices on a bus (high, low,  
> not-on-bus).
> This includes memory as well as ISA, PCI, and USB buses.
>
> o  SQL uses ternary logic frequently.  For example, a boolean column  
> in a
> table might have the values true, false, or null.  One of the first  
> things
> you used to have to do (and I don't know if things have changed over  
> the
> decades) when learning SQL was to master the ternary logic of query  
> values.
>
> o The C programming languages uses ternary logic frequently.  A lack of
> understanding of its ternary logic is a main cause of buffer overrun  
> expoits.
>
> The list goes on, but ternary logic is certainly nothing special.  I  
> even use
> it with my kids and they understand it. ("yes", "no", "go ask your  
> mother").
>

Apparently your kids understand because 'human neurons compute in  
trinary'  therefore 'the human brain is able to ignore information' .  
Most parents (and spouses) already know this.

See  
http://novaspivack.typepad.com/nova_spivacks_weblog/2005/03/ 
new_finding_bra.html

Fred