Texas Instruments TITANIUM TI-89 - Manual (Page 822)

822 Appendix A: Functions and Instructions
FnOn CATALOG
FnOn
Selects all Y= functions that are defined for the
current graphing mode.
In split-screen, two-graph mode, FnOn only
applies to the active graph.
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,1,100,step
: tempsum+i!tempsum
:EndFor
: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") ¸
"1.23í 0"
format(1.234567,"e3") ¸
"1.235í 0"
format(1.234567,"g3") ¸
"1.235"
format(1234.567,"g3") ¸
"1,234.567"
format(1.234567,"g3,r:") ¸
"1:235"