Say I have a For loops the following,
Monitor[For[y = 6, y < 380, y++
For[v = 5, v < y, v++,
For[z = 4, z < v, z++,
For[x = 3, x < z, x++,
If[x + z + v - 3 >= 2*y - 2 &&
Exponent[r[x, z, v, y], A] < (x + z + v - 2)/2,
Print[{x, z, v, y}, f[x, z, v, y]]]]]]], y]
It'll take lots of time. Is it possible to use the command Parallelize? Or how can I reduce the time?
Forloop because it uses mutable state (the iteration variable). As a beginner it's best never to useForanyway---if you are using it, you are very likely doing things in a too complicated or an inefficient manner. Use eitherDo(for which you haveParallelDobut you still need to avoid changing global variables in the loop) or in your case, useTable, which has the counterpartParallelTable. – Szabolcs May 14 at 22:04Forloops are about the worst way to go in Mathematica, you are much better off with a singleDoorTablestatement. I would try that before you worried about parallelizing it (which often has unexpected consequences). – Guillochon May 14 at 22:14Ifand guessing at the time forf, that's about 10^-7 sec. or more. per iteration on my machine, or for the whole loop something like from a 1/2 hour or more. Withf, it will be longer; if the time per iteration is 10^-5 sec., then the whole loop will take more than 2 days! – Michael E2 May 14 at 23:22