Why will negative numbers not work with "less or equal" function?

[SMP_INDY]

I am attempting to look for a -40 to get a true out. Using a "less or equal" function I place a constant of -39 on y and when the x reaches -39 or the -40 the out put remains false.

[Omar_II]

It works correctly for me.

Are you sure you are passing -39? Or is there rounding errors that are not showing in the control.

Is the display format of your control set to the max number of digits to show any rounding.

But rounding would not explain -40.

Create a small VI with nothing but the less than or equal funtion with it's input and output as a test case. 

[altenbach]

-39 is of course larger than -40, so that part is obvious. That leaves the -40 case. Are your wires blue or orange? Where do the values come from? Can you show us some code?

[falkpl]

works fine here.  do you possibly have the input wires crossed?

[SMP_INDY]

The wires are orange. Trying to figure out how to post the code here.

[SMP_INDY]

Works fine for me too in a simple vi with just this simple set up.  In the code I run the probes and  the numbers are right but the state does not change.

[Yamaeda]

Orange is doubles, which often have rounding errors. Place an indicator showing the values compared and increase the decimals shown to 15. It's common there's a 8th place decimal (or similar) causing the problem. 🙂

/Y

[SMP_INDY]

sorry check that the color is like pink

[falkpl]

pink is string not numeric you need to convert the strings oe use numerics.

[Omar_II]

Pink also could be a cluster of mixed data types.

The order of the data in your cluster will effect the comparisons.