Round off to infinity gives an unexpected result in my VI-

In the file attached, the resultant expected after round to-Infinity is 10, but what gives LabVIEW is 9.  Anyone know why?

I divided by 0,166 10 1.66 and rounding to-infinity must give 10.  But LabVIEW give 9.

In the digital representation of rounding error is the problem. The thing to remember is this decimal floating representations are approximations, while the real result of the calculation is 10, you can't really represent 10 exactly as a floating point number. While the indicator can say 10, internal representation of the answer is something like 9.999999999999999 - which is very, very close to 10, but when you go to turn it still gets rounded down.

This isn't a problem with LV, it is inherent in the floating point representations.

Mike...

Tags: NI Software

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