HP 50g Saving variable

[Claudio L.]

(06-02-2016 06:27 AM)wojtek Wrote:  The question is: why "circular reference"? Is a value evaluated before storing?

Not when storing, but when running in a program or in a symbolic expression. I think the circular reference check was moved to STO to avoid having to check for it on each evaluation. Think of a function you are trying to evaluate hundreds of times for plotting. It's much more efficient to ensure only once there's no circular reference when STOring it than having to check every single time.