Dynamic Param default value

AFL Programming
#1

I am seeking a way to dynamically change the default value for when I open my backtest formula’s Parameters Dialog.

I realize the Param() Documentation https://www.amibroker.com/guide/afl/param.html states that arguments must be constants, and I’m guessing this applies to ParamStr() as well.

I did try the code snippet below, but I believe that because of caching, the displayed value does not display the value returned by the function. Is there a backdoor workaround? Or is this something that not possible?

PS - It would also be helpful if pressing the “Reset” button recomputed the default values (e.g. from the DateTimeToStr function) rather than returning them from “memory”.

Thank you in advance.

#2

Minor clarification. Pressing Reset button the first time does execute the function. Subsequent presses of the reset button do not appear to return the value from the function.

#3

Default values are cached and won’t change until “Reset”. This is by design and can’t be changed for too many reasons to mention.

Problem regarding ParamTime function in AFL