Possible error in MOD function

[Peter K]

Try typing the following ...

=MOD((1/(TAN(PI()/4-ATAN(120/119)))),1)

This produces the answer 1 in Excel 2000 and Excel 2003.
I think it should be zero, because the expression before the comma in MOD
equals -239

Peter K

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[Ron Rosenfeld]

Try typing the following ...

=MOD((1/(TAN(PI()/4-ATAN(120/119)))),1)

This produces the answer 1 in Excel 2000 and Excel 2003.
I think it should be zero, because the expression before the comma in MOD
equals -239

Peter K

Actually, Excel calculates the part before the comma as:

-239.000000000001

A formula like:

=MOD(ROUND((1/(TAN(PI()/4-ATAN(120/119)))),10),1)

does return 0
--ron

 

[Ron Coderre]

If I evaluate the formula segments in XL2003...

=MOD((1/(TAN(PI()/4-ATAN(120/119)))),1)

becomes this:
=MOD(-239.000000000001,1)

And the MOD is: 0.999999999999233

Since the binary math may be toying with you....
try this:

=MOD(ROUND(1/(TAN(PI()/4-ATAN(120/119))),5),1)
which results in 0.

Is that something you can work with?
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Regards,

Ron
Microsoft MVP (Excel)
(XL2003, Win XP)