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VBA Excel 2010 error?

Posted on 2016-08-16
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Last Modified: 2016-09-06
I'm reducing (trig) angles [-N .. N] for all allowable N down to [-2*Pi .. 2*Pi] using a real number (double) Mod function equivalent:
=====================
Sub RadsModPi2()
Call Init   ' defines all constants; all vars are Double
' Pi2 = 6.28318530717959   a constant
With ThisWorkbook.Worksheets("Sheet1")
  For I = 6 To 294                                                 ' I is integer
    Rads = .Cells(I, 1)
    RadM = Rads - (Pi2 * (Rads \ Pi2))
    .Cells(I, 2) = RadM
    RadM = Rads - (Pi2 * Fix(Rads / Pi2))
    .Cells(I, 3) = RadM
  Next
End With
End Sub
===============
According to MS, both  " r1 - (r2 * (r1 \ r2)) "   and  " r1 - (r2 * Fix(r1 / r2)) "  are real number equivalents to the Integer mod functions, but the former produces consistently inconsistent results. Has anyone seen this before or is the a problem with the code I'm overlooking?

TIA - Ed

 
R1ModR2.png
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Question by:Ed Covney
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aikimark earned 500 total points
ID: 41759537
Fix() behaves differently with negative values than Int(), which approximates the \ operator
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by:Ed Covney
ID: 41760005
Your connecting the dots between Int() and ( \ ) did the trick; Int is 16-bit, Fix is 64-bit.
Thanks for pointing me in the right direction. - Ed
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Expert Comment

by:aikimark
ID: 41778840
Ed

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