300 * 0.0001 =?

I met the odd error in my career of LV:

in BT 7.1 and 8.0 on XP and Win7 on Intel and AMD chips:

300 * 0.0001! = 0.03

This is the case for 3, 6, 9, 18... 300, 600,... but not 30, 60, 3000 or 6000. The numbers in question seem to be more multiples of 3 who aren't as multiples of 5. It looks like LV has calculated the number of law in an indicator, but he put equal to a constant 0.03 will give you FALSE.

This is the case, the multiplication of the vi as well as the node of the expression; However, the error does not recur if you divide by 10000 instead of multiplied by 0.0001. The problem is resolved if you multiply the result by 1000, round and divide by 1000.

Please see the attached vi (LV 7.1) below as well as the jpeg format.

question: can you reproduce this? on which versions of LV / OS?

It will happen on any language on any computer that uses the standard IEEE 754 floating point (that is, almost all of them). It's the nature of how floating point work. In general you can trust controls the equality of floating-point numbers, usually, you make sure that the number is close enough to your problem.

Tags: NI Software

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