When the 1.00 is not equal to 1.00

OK, I tried to look around the forum for an answer, but wasn't really sure that a similar position can be attributed to the.  I have a request that I wrote which selects a purchase order based on the State of the device being sorted.  If there are several point of sale for a particular item, the tool will focus on the priority of the Po and if there are distributions % overall of this PO.  for example, PO #1 Gets 50% of the total, PO #2 gets 25%, PO #3 gets 25%.  Once one of the op is filled, then it calculates the remaining percent.  In the example, if PO #1 is filled, he recalcuates PO #2 and #3 in. (from above) to be a 50/50 split up to one or two of these POs is filled.  It worked pretty full so far evidence - unless my production control does not guarantee that all the POs entered total 100%.  But once they check the data they have entered, we have not had problems.

This morning I got a call that some devices are not sorting to a valid location and I walked through the vi to find what may be the issue.  As I said, if the inputs do not = 1.00, the tool does not work.  But in this case, I have 4 POs with an endowment of 0.8 + 0.07 + 0.07 + 0.06 - which in fact = 1.  But the comparison to see if this amount is equal to 1.00 is coming as FAKE!  I know that sometimes when you run are there may be truncated in some data, but this is the first I've seen that and I got only % Max to the 3rd decimal place - and this is only 2.  Help, please!

I have attached the vi and I kept the POs 4-IN. Bay.

When the 1.00 is not equal to 1.00?

When you use a BINARY computer to compare.    https://en.Wikipedia.org/wiki/Machine_epsilon

It is a 'witch hunt' super commune and it applies to all computer languages.  Basically, you can never trust a test for equality on the floats using a digital computer to test if the number is in a specific range to the place.  You can even use the constant epsilon machine in the palette of digital, if you need to get into the most accurate comparison possible.

Tags: NI Software

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