Spotfire Ideas Portal
Expression Function in calculated column or in custom expression always requires at least single parameter value to be passed.
Steps to reproduce:
- From Spotfire 7.0 Beta release , define new expression function
(via the 'Data Function properties' in the 'Edit' menu, and then in the "Expression Functions" tab "New...")
- Create ‘expression function’ with name ‘ListPackages’ using below expression.
output
- Go to Insert->Calculated Column…
- Use expression ‘ListPackages()’
- It will not validated and give warning message on Red icon ‘Invalid type for function call ‘ListPackages’’
- However, it will work if we pass at least one numeric value as parameter to ListPackages. Examples : ListPackages(1) , ListPackages(1,5,15)
- Attached are screen shots.
- Issue is also reproducible in Spotfire 6.5.2
Just ran into this today. I was trying to build a function to return a constant, Planck's constant to be precise, and you have to pass it at least one input. I want it to be like the pi() function; no input needed, just return the value. And the thing is, you can create these kinds of functions in R studio just fine. Why can't we do the same here?
I am not convinced this is feasible, because of the nature of Expression Functions. However, I'd like to better understand the use cases where this would be helpful.