Re: TI83 expr() function - bug?
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> Stuart Dawson <sd@dawson-eng.demon.co.uk> writes:
> Anybody
> Is this a bug in the TI-basic, or am I doing something wrong?
>
> This bit of code should copy any one of the matrices [A] to [I],
> depending on the string input, into [J]:
>
> Input "MATRIX? ",Str0
> expr("["+Str0+"]")\->\[J]
>
> This flames out on my TI-83. Picking the "2:Goto" option doesn't bring
> up the offending line in the program editor as it should. Instead, it
> just clears the home screen and quits. Same thing with a numbered list
> (L1 to L6), but it works fine with a named list.
>
> Any ideas?
>
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
> Stuart Dawson Dawson Engineering
> 49 Knockbracken Park, Belfast BT6 0HL, Northern Ireland
> sd@dawson-eng.demon.co.uk +44 1232 640669
> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
>
> Turnpike evaluation. For information, see http://www.turnpike.com/
>
>>>>
The symbols for matrices *appear* to be letters enclosed in square brackets,
but they're really special tokens. If you store an equation with matrices into
a
string (using Equ/>/String() and edit the string, you'll see that "[A]" is
really
just one character.
Harry
References: