I would like to add that usually you should avoid using non-integer numbers as control variables in loops. The float representation used by the computer may introduce rounding errors and break your logic.

For instance, on my computer: 

for ($i = 0; $i < 1; $i += 0.2) {};
say $i;
  #==> 1.0

for ($i = 0; $i < 2; $i += 0.2) {};
say $i;
  #==> 2.2

[download]

So, the first loops works right, but the second one runs an extra iteration unexpectedly!

The right approach in this cases is to use an intermediate integer variable: 

for ($ix = 0; $ix < 10; $ix++) {
    my $i = $ix * 0.2;
    ...
}

[download]

In reply to Re: Parallelization of multiple nested loops by salva
in thread Parallelization of multiple nested loops by biosub

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