try(4/0,99) Is there anyway to stop dividing by zero errors?

if(!{[.]HL} && !{[.]LL}, 0, abs(({[.]HL} +{[.]LL}) / 2) * 100))

[image] Expression Divide By 0 Ignition try() wraps the expression evaluation in a try/catch and if an exception is caught uses the bailout value. Divide by None will throw an exception, divide by 0 is infinity, no exception thrown. Seems reasonable to me!

[image] dividing by zero does throw an exception tho and the try function isn't catching it on the function above this try(4/None,99) does render the failback value

Divide by None will throw an exception, divide by 0 is infinity, no exception thrown.

No, dividing by zero is supported fine in the expression evaluation: [image] The type conversion error is happening when the tag system receives the infinity from the expression and cannot coerce it to a value to apply to the tag. As in the link @jlandwerlen posted above.

abs(({[.]HL} - {[.]LL)) / (({[.]HL} + {[.]HL}) / 2) * 100 Maybe I can ask for more pointed help. I still want to render a percentage difference of '0' when both the HL and LL tag are zeros. Any ideas?

Use if() as demonstrated in the link posted above. Also see the docs. https://docs.inductiveautomation.com/display/DOC81/if

if(!{[.]HL} && !{[.]LL}, 0, abs(({[.]HL} +{[.]LL}) / 2) * 100)

Try() expression doesn't catch dividing by zero?

Ignition

jlandwerlen July 10, 2023, 6:12pm 2