[Novalug] [OT] Question for computer scientist
bdalzell at qis.net
Mon Feb 2 16:44:56 EST 2009
If you have a value you are using a lot in a program - in this case
powers of 2 (2^n and 1/2 to the n). Is it easier on the system (or
faster) to compute them when you need them or fetch them from a
premade look up table?
I ask this because I am working on a program to compute coefficients of
inbreeding and the closed source compiled dos program I have been using
seems to have a look up table file that it uses in relation to coi and I
think - examining the table in a hex editor that it is powers of two
I do not have access to the source code for the old dos program. but i
have been running it to check and see if the calcs of the value
generated by my program are correct.
No one seems to have published a numerical recipe for calculating
coefficient of inbreeding anyplace i can find via google so I (a
non-mathematician) am trying to come up with one.
I have also decided if I get one (numerical recipe) that works it is going
onto the web as is the program. Since the program is in perl it is by
defiition open source.
Bonnie Dalzell, MA
mail:5100 Hydes Rd PO Box 60, Hydes,MD,USA 21082-0060|EMAIL:bdalzell at qis.net
freelance anatomist, vertebrate paleontologist, writer, illustrator, dog
breeder, computer nerd & iconoclast... Borzoi info at www.borzois.com.
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