Texas Instruments TI-89 Tip List page 378

Change the mode setting:
setMode( modeString ,string(exact(mod(expr(getMode( modeString )), n )+1)))
The next mode setting number is calculated with the mod() function which provides the wrap-around
we need. For example, if there are three setting options, then we need to convert a 1 to 2, 2 to 3 and 3
to 1. The calculation works like this for n = 3:
mod(1,3)+1 = 2
mod(2,3)+1 = 3
mod(3,3)+1 = 1
Applying exact() to the mode setting number calculation removes any decimal points or exponent
characters, which may be present, depending on the current display format setting. This must be done
because setMode() does not accept these characters in the setString argument. By including exact(),
the expression will work with any display mode setting and in Approx mode.
This table shows the values of modeString and n for the modes which can be set with this method.
Mode category
"Graph"
"Display digits"
"Angle"
"Exponential Format"
"Complex Format"
"Vector Format"
"Pretty Print"
"Split screen"
"Number of Graphs"
"Graph 2"
"Split screen ratio"
"Exact/Approx"
"Base"
Refer to the User's Guide entry for the setMode() function for descriptions of the mode setting options.
Note that modes "Split 1 App" and "Split 2 App" do not use number codes for the settings, and the
"Language" mode does not use a number code for the mode itself. These modes cannot be set with
this method.
If you use several keyboard programs to change modes, you can save a little memory by using a
program to change the mode settings:
modecycl(mode,n)
Prgm
©("mode",n) Toggle "mode" with n options
©3jan02/dburkett@infine.com
setmode(mode,string(exact(mod(expr(getmode(mode)),n)+1)))
EndPrgm
then you could use these keyboard programs with [DIAMOND] [1], [DIAMOND] [2] and [DIAMOND] [3]:
(setting 1 changes to setting 2)
(setting 2 changes to setting 3)
(setting 3 wraps around to setting 1)
modeString and number of options for various modes
modeString
"1"
"2"
"3"
"4"
"5"
"6"
"7"
"8"
"11"
"12"
"13" 2 for TI-89, 3 for TI-92+
"14"
"15"
n
6
26
2
3
3
3
2
3
2
6
3
3
9 - 19