Texas Instruments TI-89 Manual Book page 467

FnOn [1] [, 2] ... [,99]
Selects the specified Y= functions for the
current graphing mode.
Note: In 3D graphing mode, only one
function at a time can be selected.
selects
z2(x,y)
selected function. In the other graph modes,
previously selected functions are not
affected.
For
CATALOG
For var, low, high [, step]
block
EndFor
Executes the statements in
for each value of
increments of
must not be a system variable.
var
can be positive or negative. The default
step
value is 1.
can be either a single statement or a
block
series of statements separated with the ":"
character.
format()
MATH/String menu
format(expression[, formatString])
Returns
on the format template.
expression
formatString
form: " [n
F
indicate optional portions.
F[ n ] : Fixed format. n is the number of digits
to display after the decimal point.
n : Scientific format. n is the number of
S[ ]
digits to display after the decimal point.
: Engineering format. n is the number of
E[ n ]
digits after the first significant digit. The
exponent is adjusted to a multiple of three,
and the decimal point is moved to the right
by zero, one, or two digits.
n c : Same as fixed format but also
G[ ][ ]
separates digits to the left of the radix into
groups of three. c specifies the group
separator character and defaults to a comma.
If c is a period, the radix will be shown as a
comma.
c : Any of the above specifiers may be
[R ]
suffixed with the
single character that specifies what to
substitute for the radix point.
450 Appendix A: Functions and Instructions
and deselects any previously
iteratively
block
, from to
var low
.
step
string
as a character string based
expression
must simplify to a number.
is a string and must be in the
", " n ", " n ", " n c
] S[ ] E[ ] G[ ][
c radix flag, where c is a
R
FnOn 2
Program segment:
©
:0! tempsum : 1! step
:For i,1,100,step
, in
high
: tempsum+i! tempsum
:EndFor
:Disp tempsum
©
Contents of tempsum after
execution:
Contents of tempsum when step
is changed to 2:
format(1.234567,"f3") ¸
format(1.234567,"s2") ¸
format(1.234567,"e3") ¸
", where
] [ ]
format(1.234567,"g3") ¸
format(1234.567,"g3") ¸
format(1.234567,"g3,r:") ¸
5050
2500
"1.235"
"1.23í 0"
"1.235í 0"
"1.235"
"1,234.567"
"1:235"