else
res[1]→a
res[2]→b
endif
©Extract c, d, e variables
util\rq3v(cde)→res
if res="ERR" then
(... handle error here ...)
else
res[1]→c
res[2]→d
res[3]→e
endif
ab and cde are strings that are returned from the Request commands in the dialog box. These are
passed directly to rq2v() and rq3v(). The returned lists are saved in variable res. For example, if the
users enters
1,2
at the ab prompt, and
3,4,5
at the cde prompt, then ab = "1,2" and cde = "3,4,5". The res result variable will be, respectively, {1,2}
and {3,4,5}. During the variable extraction sections, the individual elements of res are stored to the
appropriate variable. Note that both extraction sections test for the error condition. The actual error
handling depends on your program. Typically, you would display an error message and give the user
another chance to correctly enter the variables.
You can use this method to get numbers and expressions from the user, but not multiple lists or
matrices, because the programs do not distinguish between the commas that separate the expressions
and the commas within the expressions.
[9.13] Disable ALPHA default in TI-89 AMS 2.05 dialog boxes
When a Request function in a dialog box prompts for input, AMS 2.05 automatically turns the Alpha
input mode on. This 'feature' is not implemented on the TI-92+, which has an alpha keyboard. Some
users find this irritating, because usually you are entering numeric parameters. So, you either have to
remember to press [ALPHA] to disable the alpha keyboard, or you will type characters when you meant
to type numbers. Fortunately, Kevin Kofler has written a program that disables this feature. The
program is called autoaoff(), and you can get it here:
http://ti89prog.kevinkofler.cjb.net/
autoaoff() is a TSR (terminate and stay resident) program for the TI-89 which does not reduce the
amount of RAM available for normal calculations. It requires a special program for un-installation,
which is included in the distribution. The readme.txt file is thorough and detailed.
(Credit to Kevin Kofler)
9 - 17
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