Harvey,

I'm not sure of what you mean by "eliminate roundoff" and what you expect
the loop to do, but the way you have it, it will go through the loop only
once and that's for the first value of -0.2. The next value will be 0.8
which is 0.2. If you specify a step value, you'll get more iterations:

Dim i As Double
For i = -0.2 To 0.2 Step 0.1
Debug.Print i
Next


"Harvey" wrote:

Anyone knows how to eliminate roundoff error in a loop?

Dim i as double
for i= - 0.2 to 0.2
debug.print i
next

Thanks:)