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Author Topic: String to List Glitch  (Read 10200 times)

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Offline Insorak

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String to List Glitch
« on: December 22, 2009, 02:09:59 pm »
Calculator: TI-84+ SE, OS 2.43

So apparently, on this calculator, you can store a string to a list without getting a syntax error.

Code: [Select]
" →L1
There's lots of weird properties about this "glitch", and I have a few questions about it...

If you enter the code above on the homescreen, and then just enter L1, you get an ERR:SYNTAX. When you press Goto, it shows essentially what's in the codebox above. Some other times, you get an ERR:DATA TYPE instead of an ERR:SYNTAX. It's weird. Yet, if you do a Rcl on L1, you can get the former contents of L1, or an empty list ({}) if L1 is empty. How does this work in memory?

It screws up the list editor if you try to view it there (Stat → Edit). What's up with the weird diamond symbol that appears next to the list name?

How can this error even occur? Apparently TI wasn't smart enough to prevent us from storing strings to lists? :O
« Last Edit: December 22, 2009, 02:10:46 pm by Insorak »
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Offline Builderboy

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Re: String to List Glitch
« Reply #1 on: December 22, 2009, 02:44:51 pm »
Well acctualy there is a reason for being able to store Strings to lists, it is a feature, not a glitch! :) Try storing "L2+2" to L1 and then store {1,2,3,4} into L2, if you access L1, you will see it will equal {3,4,5,6}.  The diamond you see means that that list cannot be changed or edited, as it is governed by an equation, and not an actual set of numbers.
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Offline ztrumpet

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Re: String to List Glitch
« Reply #2 on: December 22, 2009, 03:14:20 pm »
That's really cool! I might have to use this feature...
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Offline mapar007

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Re: String to List Glitch
« Reply #3 on: December 22, 2009, 03:47:02 pm »
As builderboy says, it's not a glitch. It's the undocumented (?) list formula feature. Check asmin28, there's a reference to them in the chapter about the VAT.
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Offline Insorak

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Re: String to List Glitch
« Reply #4 on: December 22, 2009, 03:52:24 pm »
Ahh, okay. That's interesting.

I never knew about that. Stupid undocumented stuff.
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Offline mapar007

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Re: String to List Glitch
« Reply #5 on: December 22, 2009, 03:53:24 pm »
Well, actually I'm not sure if it is undocumented... You should check the manual. (or I should do it myself :P )
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Offline DJ Omnimaga

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Re: String to List Glitch
« Reply #6 on: December 22, 2009, 07:31:24 pm »
There's stuff about it in the manual IIRC, I am sure I saw it, altough I never bothered to try
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Offline jsj795

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Re: String to List Glitch
« Reply #7 on: December 23, 2009, 04:42:01 pm »
I saw those in TI83+ manual.
But I never used those
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Offline ztrumpet

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Re: String to List Glitch
« Reply #8 on: December 23, 2009, 05:04:07 pm »
What is the token (in hexadecimal) for the diamond like symbol, asm-ers?

Edit:
Quote from: mapar007 on December 22, 2009, 03:47:02 pm
As builderboy says, it's not a glitch. It's the undocumented (?) list formula feature. Check asmin28, there's a reference to them in the chapter about the VAT.
That's pretty cool! For those who havn't looked yet and kinda-or-more understand Asm, check day 21 (in the lesson folder) of http://www.ticalc.org/archives/files/fileinfo/268/26877.html .
« Last Edit: December 23, 2009, 05:07:53 pm by ztrumpet »
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Offline meishe91

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Re: String to List Glitch
« Reply #9 on: May 24, 2010, 04:26:59 pm »
What about when you do something like "L2+2→Y? How does that work since you don't have the multi-number output a list does?
« Last Edit: May 24, 2010, 04:27:18 pm by meishe91 »
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Offline calcdude84se

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Re: String to List Glitch
« Reply #10 on: May 24, 2010, 05:11:34 pm »
it actually makes a list Y, just like {1,2,3,4->Y would
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Offline DJ Omnimaga

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Re: String to List Glitch
« Reply #11 on: May 24, 2010, 05:21:33 pm »
Yeah I remember now the L is optional when creating a list. The BASIC parser seems to detect if you try to store a list instead of variable
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Offline calcdude84se

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Re: String to List Glitch
« Reply #12 on: May 24, 2010, 05:34:47 pm »
Which makes Input commands so annoying, because they act the same. This strange behavior can also be interesting, as this brainteaser contest shows
« Last Edit: May 24, 2010, 05:36:23 pm by calcdude84se »
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Offline DJ Omnimaga

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Re: String to List Glitch
« Reply #13 on: May 24, 2010, 05:38:14 pm »
what kind of issue it can cause with Input that hinders people?
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Offline calcdude84se

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Re: String to List Glitch
« Reply #14 on: May 24, 2010, 05:43:11 pm »
Probably more accurate is that it can make Input more annoying, because if you wanted the user to input a real/complex number, they can input a list, and now you have a list that you're program probably doesn't ever use.
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