Dim Error on empty List

[brickviking Profile]

I've found one small bug or lack of functionality, with no real way to work around it. If a List happens to be empty (no values), and I try retrieving any information about that list from within a program (Dim List n), I get Dimension Error on the fx-9860GII (or simply Dim Error on the fx-9750G+). I can't test for a non-present list without running into the aforementioned Dimension Error. Does anyone know a way around this?

(Post 12)

[TeamFX Profile]

There is a trick on fx-9860G/GII and FX 1.0/2.0 models:

10->Z // expected list size
Getkey=79=>Z->Dim List 1 // initial setup
Z->List 1[1] // overwrite or create first cell
Dim List 1=/=List 1[1]=>"Error"

So the first list cell cannot be used and is always overwritten.
I would also recommend to store a magic number or checksum in the last list cell, in case there is another list with the same size but incompatible data.

[TeamFX Profile]

If you're interested in Casio-Basic programming, have a look here for more tricks:
http://community.casiocalc.org/topic/54 ... -from-cfxm

Last post contains the corrected Omnimaga links.

[brickviking Profile]

There is a trick on fx-9860G/GII and FX 1.0/2.0 models:

10->Z // expected list size
Getkey==79=>Z->Dim List 1 // initial setup
Z->List 1[1] // overwrite or create first cell
Dim List 1=/=List 1[1]=>"Error"

So the first list cell cannot be used and is always overwritten.
I would also recommend to store a magic number or checksum in the last list cell, in case there is another list with the same size but incompatible data.

Um, I'm confused, so I've got some questions.

• What's the GetKey for?
• Is =/= actually [NOT EQUAL] and == is [EQUAL]?
• And, does this count on me having a List element 0 assigned for the expected list?
• One last thing, will this work on a fx9750G+, or just the fx9860G/GII ?

(Post 13)

[TeamFX Profile]

What's the GetKey for?

Go to the PRGM menu and start your program by pressing [F1].
[F1] is often used for setup/installation purposes in Casio-Basic programs.

=/= is the unequal sign.
== was C syntax, I fixed that.

List 1[0] can contain a subject name but it doesn't matter if there is one or not.
"Stuff"->List 1[0] will also create List 1[1] if the list did not exist.

This will not work on an fx-9750G or CFX.