450 Appendix A: Functions and Instructions
8992APPA.DOC TI-89 / TI-92 Plus: Appendix A (US English) Susan Gullord Revised: 02/23/01 1:48 PM Printed: 02/23/01 2:21 PM Page 450 of 132
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. FnOn 2
selects z2(x,y) and deselects any previously
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 block iteratively
for each value of var, from low to high, in
increments of step.
var must not be a system variable.
step can be positive or negative. The default
value is 1.
block can be either a single statement or a
series of statements separated with the “:”
character.
Program segment:
©
:0!tempsum :
1
!step
:For i,
1
,
1
00,step
: tempsum+i!tempsum
:En
d
For
:Disp tempsum
©
Contents of tempsum after
execution: 5050
Contents of tempsum when step
is changed to 2:2500
format() MATH/String menu
format(expression[, formatString]) ⇒ string
Returns expression as a character string based
on the format template.
expression must simplify to a number.
formatString is a string and must be in the
form: “F[n]”, “S[n]”, “E[n]”, “G[n][c]”, where [ ]
indicate optional portions.
F[n]: Fixed format. n is the number of digits
to display after the decimal point.
S[n]: Scientific format. n is the number of
digits to display after the decimal point.
E[n]: Engineering format. n is the number of
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.
format(1.234567,"f3") ¸
"
1
.235"
format(1.234567,"s2") ¸
"
1
.23í0"
format(1.234567,"e3") ¸
"
1
.235í0"
format(1.234567,"g3") ¸
"
1
.235"
format(1234.567,"g3") ¸
"
1
,234.567"
format(1.234567,"g3,r:") ¸
"
1
:235"
G[n][c]: Same as fixed format but also
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.
[Rc]: Any of the above specifiers may be
suffixed with the Rc radix flag, where c is a
single character that specifies what to
substitute for the radix point.