Texas Instruments Titanium TI-89, Руководство пользователя

Страница: 801 / 977

798 Appendix A: Functions and Instructions
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
: 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")
¸
"1.23 í 0"
format(1.234567,"e3")
¸
"1.235
í
0"
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.
[R
c
]
: Any of the above specifiers may be suffixed
with the
R
c radix flag, where c is a single character
that specifies what to substitute for the radix point.
fPart()
MATH/Number menu
fPart( expression1 )
⇒
expression
fPart( list1 )
⇒
list
fPart(
matrix1
)
⇒
matrix
Returns the fractional part of the argument.
For a list or matrix, returns the fractional parts of the
elements.
The argument can be a real or a complex number.
fPart(
ë
1.234)
¸ ë
.234
fPart({1, ë 2.3, 7.003}) ¸
{0
ë
.3 .003}