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HP-67 internal function timings


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Post: #5
02-10-2013, 10:37 AM
Dieter Offline
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I admit I am amazed at the speed of the 34s Matrix functions - even a 10x10 random matrix is inverted in fractions of a second (approx. 0,7×n3 ms on my hardware). That's roughly as fast as some transcendental functions on earlier HPs like the 67/97.

I remember a table with the execution times of most 67/97 functions, given in milliseconds, somewhere in a HP related magazine or journal. I am sure I must have stored it somewhere on some harddrive, but I cannot seem to find it. Maybe someone can help and tell me where to find this info?!

Dieter

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Post: #6
02-10-2013, 04:57 PM
Jake Schwartz Offline
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Quote:
I remember a table with the execution times of most 67/97 functions, given in milliseconds, somewhere in a HP related magazine or journal. I am sure I must have stored it somewhere on some harddrive, but I cannot seem to find it. Maybe someone can help and tell me where to find this info?!

Hi,

One of these appeared in PPC's "Better Programming On The HP67/97" publication, which was sent to members roughly in June of 1978, around the time of Volume 5, Number 5 of the PPC Journal. The table appears in pages 27-29.

Jake

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Post: #7
02-11-2013, 02:50 PM
Dieter Offline
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Ah, thank you - now I know what to look for. I think I have a PDF of this. It must be somewhere deep down in some sub-sub-sub-folder... :-)

Dieter

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Post: #8
02-10-2013, 05:18 PM
Paul Dale Offline
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Quote:
I admit I am amazed at the speed of the 34s Matrix functions - even a 10x10 random matrix is inverted in fractions of a second (approx. 0,7×n3 ms on my hardware). That's roughly as fast as some transcendental functions on earlier HPs like the 67/97.

The surprising thing is I'm not using a particularly efficient algorithm for matrix inversion. A Doolittle LU decomposition with partial pivoting followed by solving lots of equations.


- Pauli

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