An HP71 does not like F as a variable

[Valentin Albillo]

(12-11-2023 03:32 AM)waspentalive Wrote:  1030 F=2
run
ERR L1030:Data Type

>F=0
ERR:Data Type

Replace F with J throughout my program - now it works?? Why is there a problem with a variable named "F"

Variable F already existed as a different type, say a matrix, so trying to use it as an scalar is doomed to fail. Simply execute DESTROY ALL either from the command prompt or as the very first executable statement in a program and afterwards you may use F to your heart's content.

The takeaway: always include DESTROY ALL as the first executable statement in your programs, like this:

10 DESTROY ALL

See if that helps.

V.