Appendix B: Technical Reference
912
Regardless of the Complex Format mode setting, variables that have no
stored value and that do not end with an underscore (_) are treated as real
numbers. To perform complex symbolic analysis, you can use either of the
following methods to set up a complex variable.
Method 1:
Use an underscore _
(
TI
.
89 Titanium:
¥
q
Voyage™ 200
2
q
) as the last character in
the variable name to designate a complex variable. For example:
z_ is treated as a
complex variable if it does
not have a stored value.
Method 2:
Store an unreal value into any variable. For example:
x+y
i
!
z
Then z is treated as a
complex variable.
Radian angle mode is recommended for complex number calculations.
Internally, the TI-89 Titanium / Voyage™ 200 converts all entered trig
values to radians, but it does not convert values for exponential, logarithmic,
or hyperbolic functions.
In Degree angle mode, complex identities such as
e^(
i
q
) = cos(
q
) +
i
sin(
q
)
are not generally true because the values for cos and sin are converted to
radians, while those for
e^(
) are not. For example,
e^(
i
45) = cos(45) +
i
sin(45) is treated internally as
e^(
i
45) = cos(
p
/4) +
i
sin(
p
/4). Complex
identities are always true in Radian angle mode.
Using Complex
Variables in
Symbolic
Calculations
Note:
For best results in
calculations such as
cSolve()
and
cZeros()
, use
Method 1.
Complex Numbers
and Degree Mode
Note:
If you use
Degree
angle mode, you must make
polar entries in the form
(r
o
q
). In
Degree
angle
mode, an r
e
i
q
entry causes
an error.
Summary of Contents for Titanium TI-89
Page 9: ...Getting Started 6 TI 89 Titanium keys Ë Ì Í Ê ...
Page 34: ...Getting Started 31 2 or D 2 B u s i n e s s D B D B Press Result ...
Page 43: ...Getting Started 40 3 0 D B D D B D Press Result ...
Page 44: ...Getting Started 41 D 2 0 0 2 D B Scroll down to October and press Press Result ...
Page 58: ...Getting Started 55 Example Set split screen mode to TOP BOTTOM Press Result 3 B D ...
Page 70: ...Getting Started 67 ...
Page 175: ...Operating the Calculator 172 From the Keyboard ...
Page 456: ...Tables 453 ...
Page 527: ...Data Matrix Editor 524 ...
