When I subtract two numbers DBL and try to compare the result with another DBL, it fails

I found a curious problem with subtraction and compare numbers DBL in LabVIEW (8.6). Here's how it works:

1. subtract two numbers DBL such that the result is not incorporated. (Say, 3.2 - 3.1)

2. compare the result with a constant/control that is on the result of the subtraction (in the example, 0.1)

3 see the output of the comparison.

If the result of the subtraction is an integer, the Boolean result is (as expected). If the result is not complete, the comparison fails.

(Now, if I simply compare two floating point numbers, it works, so the issue is not with the node comparison itself, but with the data that is entered to the node). Can someone understand why this happens? It's unexpected, it's a pretty serious bug.

It is provided with all programming languages. Numbers do not have an exact binary floating-point representation. This has been discussed endlessly. Never use the equal function with floats. You can use the function in the range and force.

Tags: NI Software

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