Re: program to compute gears, with table

[David Scheidt]

In rec.bicycles.tech Joerg <news@analogconsultants.com> wrote:
:On 2017-09-08 12:59, David Scheidt wrote:
:> In rec.bicycles.tech Joerg <news@analogconsultants.com> wrote:
:> :On 2017-09-08 10:52, Emanuel Berg wrote:
:> :> Skip Montanaro wrote:
:> :>
:> :>> * Why the 1.0 divisor when computing gear?
:> :>
:> :> As explained, otherwise it'll be integer
:> :> division. But I think that qualifies as a hack
:> :> (not an ugly hack tho) so there is no shame in
:> :> spotting it an "error" :)
:> :>
:> :>> * You can skip the radius and use wheel
:> :>> (diameter) directly in computing
:> :>> the circumference.
:> :>
:> :> Right!
:> :>
:> :>> * It never occurred to me to do this in Lisp.
:> :>> I always just use an online calculator, like:
:> :>>
:> :>> 
http://www.gear-calculator.com/?GR=DERS&KB=34,50&RZ=12,13,15,17,19,21,23,25&UF=2150&TF=90&SL=2.6&UN=KMH
:> :>
:> :> Let's agree there is no need to do it in Lisp.
:> :> Only a desire :)
:> :>
:>
:> :Why make things complicated? I do such stuff with spreadsheets. That's
:> :what they were invented for. Part of every office software including
:> :free ones.
:>
:> I rewrote his code in common lisp in less time than it takes excel to
:> start.
:>

:Wow, you must be able to type at hundreds of letter a second. Here, it 
:takes less than 2sec for Excel to start. Mostly only a split second to 
:open the file because I usually have it running nearly all the time.

On my mac at work, from the time I double click the excel icon to the
time it is ready to do work is over a minute.  It's a modern machine,
running an old version of excel.  The windows machine I have, but
never use, which is more powerful, and running a current version,
takes even longer.  It does have a spinny disk, and not an ssd.
(that's not counting the time to takes to boot up, since it's off.)

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sig 57