Cycle, Cyclepic, 4444 cylind – Texas Instruments TITANIUM TI-89 User Manual
Page 803: Czeros(), Appendix a: functions and instructions 803

Appendix A: Functions and Instructions
803
Cycle
CATALOG
Cycle
Transfers program control immediately to the
next iteration of the current loop (
For
,
While
, or
Loop
).
Cycle
is not allowed outside the three looping
structures (
For
,
While
, or
Loop
).
Program listing:
:¦ Sum the integers from 1 to
100 skipping 50.
:0! temp
:For i,1,100,1
:If i=50
:Cycle
:temp+i! temp
:EndFor
:Disp temp
Contents of
temp
after execution:5000
CyclePic
CATALOG
CyclePic
picNameString
,
n
[
,
[
wait
] ,
[
cycles
]
,
[
direction
]]
Displays all the PIC variables specified and at the
specified interval. The user has optional control
over the time between pictures, the number of
times to cycle through the pictures, and the
direction to go, circular or forward and
backwards.
direction
is 1 for circular or ë 1 for forward and
backwards. Default = 1.
1. Save three pics named
pic1
,
pic2
, and
pic3
.
2. Enter:
CyclePic
"
pic
",3,.5,4,ë1
3. The three pictures (3) will be displayed
automatically—one-half second (.5) between
pictures, for four cycles (4), and forward and
backwards (ë1).
4444Cylind
MATH/Matrix/Vector ops menu
vector
4444Cylind
Displays the row or column vector in cylindrical
form [r
∠
q, z].
vector
must have exactly three elements. It can be
either a row or a column.
[2,2,3] 4Cylind
¸
[
2ø ‡2
p
4
3
]
cZeros()
MATH/Algebra/Complex menu
cZeros(
expression
,
var
)
⇒
⇒
⇒
⇒
list
Returns a list of candidate real and non-real
values of
var
that make
expression
=0.
cZeros()
does this by computing
exp
8
8
8
8list(cSolve(
expression
=0,
var
)
,
var
)
.
Otherwise,
cZeros()
is similar to
zeros()
.
Note: See also
cSolve()
,
solve()
, and
zeros()
.
Display Digits mode in
Fix 3
:
cZeros(x^5+4x^4+5x^3ì 6xì 3,x)
¸
{л 2.125 л.612 .965
л
1.114
м
1.073ш
i
л
1.114
+
1.073ш
i
}
Note: If
expression
is non-polynomial with
functions such as
abs()
,
angle()
,
conj()
,
real()
,
or
imag()
, you should place an underscore
(
¥
)
at the end of
var
. By default, a variable is
treated as a real value. If you use
var
_
, the
variable is treated as complex.
You should also use
var
_ for any other variables
in
expression
that might have unreal values.
Otherwise, you may receive unexpected results.
z is treated as real:
cZeros(conj(z)м1м
i
,z) ¸
{1+
i
}
z_ is treated as complex:
cZeros(conj(z_)м1м
i
,z_) ¸
{1ì
i
}
cZeros({
expression1
,
expression2
[,
…
]
},
{
varOrGuess1
,
varOrGuess2
[,
…
]
})
⇒
⇒
⇒
⇒
matrix
Returns candidate positions where the
expressions are zero simultaneously. Each
varOrGuess
specifies an unknown whose value you
seek.