User Key Assignment Error on HP Prime (K_Neg)

[mapc]

Dear All,

I have tried using the User Key to customize uncertainty progression. It works for all the keys I have tried so far except for K_Neg. It even works for KS_Neg, KA_Neg and KSA_Neg. 

With the following code I get ERRNEG2 and ERRSUM to work but not ERRNEG1. I have also tried to write the KEY sections in different order without success. 

KEY K_Neg()

BEGIN

RETURN "ERRNEG1";

END;

KEY KS_Neg()

BEGIN

RETURN "ERRNEG2";

END;

KEY K_Plus()

BEGIN

RETURN "ERRSUM";

END;

Maybe K_Neg descriptor is wrong? Not available? Issues with other keys as well?

I would appreciate any clues.

BR,

Marco

[Maké]

You can see ... http://edspi31415.blogspot.com.ar/2013/09/hp-prime-tip-setting-up-user-keys.html

[mapc]

Dear Maké,

Thanks for the quick response! The reference is helpful to identify that the syntax I am using is correct.

However I found the user key is context sensitive. K_Neg does not work for RPN entry mode in Home (however many other keys - all that I have tested so far - do work in this condition). 

For example in case of the return value is set to "STRING()" in Textbook entry mode, multiple +/- key presses result in (with user key mode in persistence state)

STRING()

STRING(-)

STRING()

STRING(-)

ETC...

This behavior seems to be very unpredictable. Any clues for this forced behavior? Maybe an unimplemented feature?

Regards

Marco

[Maké]

See, this cases ...

https://www.thecalculatorstore.com/Calculator-blog/HP-Prime-user-keys

http://www.hpmuseum.org/forum/archive/index.php?thread-404.html

The User Guide, you can download, from ... https://support.hp.com/us-en/product/hp-prime-graphing-calculator/5367459/manuals