Talk:Hofstadter Figure-Figure sequences: Difference between revisions
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(→timings for the REXX solutions: added a new section. -- ~~~~) |
m (→timings for the REXX solutions: changed IF statement to use short circuit. -- ~~~~) |
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I normally don't including timings for the REXX solutions that I post, but when I saw the 2<sup>nd</sup> REXX example's timings, |
I normally don't including timings for the REXX solutions that I post, but when I saw the 2<sup>nd</sup> REXX example's timings, |
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<br>I decided to go back and include the timings here as the 2<sup>nd</sup> example's timings seemed a bit high. |
<br>I decided to go back and include the timings here as the 2<sup>nd</sup> example's timings seemed a bit high. |
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<br>I didn't expect a |
<br><br>I didn't expect a difference of magnitude. |
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<lang rexx>/*REXX pgm to calculate & verify the Hofstadter Figure-Figure sequences.*/ |
<lang rexx>/*REXX pgm to calculate & verify the Hofstadter Figure-Figure sequences.*/ |
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call time 'Reset' |
call time 'Reset' |
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ffs: procedure expose r. s. rr. ss.; parse arg n |
ffs: procedure expose r. s. rr. ss.; parse arg n |
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do k=1 for n while s.n==0 /*search for not null R │ S num.*/ |
do k=1 for n while s.n==0 /*search for not null R │ S num.*/ |
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if s.k\==0 |
if s.k\==0 then if ffr(k)\==0 then iterate /*short circuit*/ |
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km=k-1; _=s.km+1 /*the next SS number, possibly.*/ |
km=k-1; _=s.km+1 /*the next SS number, possibly.*/ |
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_=_+rr._ /*maybe adjust for the FRR num.*/ |
_=_+rr._ /*maybe adjust for the FRR num.*/ |
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took 1.58 seconds. |
took 1.58 seconds. |
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</pre> |
</pre> |
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The (above) example was run under Windows 7 on |
The (above) example was run under Windows 7 on a HP box (3.2GHz) using Regina. |
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<br><br> |
<br><br> |
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