Condition on equation

[EricR]

Hi! I've just received my new HP Prime (latest model) and am very excited. I'm also new to this forum. But I'm not new to HP calculators, I have a HP 48 and a HP50g.

Anyway, fiddling around with it, I was wondering whether there is a way to specify a condition on a formula in CAS mode. For example, if I want to add the condition x<1 before solving for x. Is that possible?

[Carlos295pz]

With assume( ) and additionally( ) you can perform those actions

[informach]

Hi!, EricR :
Try with CASE, per example ...
CASE IF A<0
THEN RETURN "negative";
END;
IF 0≤A≤1
THEN RETURN "small";
END;
DEFAULT RETURN "large";
END;

See, from User Guide ... http://h10032.www1.hp.com/ctg/Manual/c05332710

[EricR]

Thanks a lot! assume() was what I was looking for. I've got to study the manual...

[informach]

Hi!, EricR :
You can use too ... IFTE
Check, with ...
https://en.hpprime.club/docs/reference/IFTE
https://en.hpprime.club/articles/prime-t...re-part-2/

[Eddie W. Shore]

How you would cancel an assume/additionally?

[Carlos295pz]

purge()

[Arno K]

As far as I know the only way is "purge(var)".
Arno