Hi, I want to create a simple output ranging from 0 to zmax in distinct steps. Those steps shall get larger towards the end. Here's my simple script: 
my $zmax = 60;    # Maximum depth in your model
my $dz = 0.05;    # Grid spacing in z-direction

for (my $i=0; $i <= $zmax; $i = $i+$dz) {
   print $i."\n";
}

[download]
And here's the output at a later stage: 
3.6
3.65
3.69999999999999
3.74999999999999

[download]
That's not the correct value !! This prevents me from making a direct comparison with an integer number (which I can find ways around), but the result is simply wrong!! What's happening there?

In reply to Wrong calculations in for loop by Anonymous Monk

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