machine

Joe Riel — Tue, 23 Feb 2010 10:04:52 Z

Hmm. Where does t enter the expressions? Using all numeric values my machine executes that nested loop (P=100, Q=20, R=20) in about 0.75 seconds. Using evalhf (and declaring the arrays appropriately) it does it in 0.2 seconds. Leaving all non-arrays as symbolic it took 2.2 seconds. This is using an i5 processor.

Sorry, I should have stated

petrivka — Wed, 24 Feb 2010 01:14:14 Z

Sorry, I should have stated where t shows up--it is in the parameter "xinot," as the simple expression v*t/L (v and L are known values).

I'm running this in Maple 12 on a Pentium 4 (old, I know), and I'm getting in the range of 25 seconds with this one operation. I tried removing the dependence on t from the expression and execute the code as just numeric values, and it still takes about 20 seconds. I guess there isn't much I can do then to improve the runtime short of getting a new computer?

Could it be that accessing the terms of lam, beta, and all those others is slowing things down? I have those defined in a similar manner as the coefficient c, i.e.:

for i from 1 to 128 do

lam[i]:=somerootofaperiodicfunction

end:

-sidenote: I'm not sure really what kind of datatype I'm creating with this sort of definition, since it's not a list or an array. Maybe a table? Maple datatypes are kind of confusing to me, honestly.

Thanks for your help thus far.

MaplePrimes - answers and comments on Question, Some help with improving efficiency

machine

Sorry, I should have stated