Texas Instruments TI-89 Titanium User Manual page 815

) ⇒
squareMatrix1
ln(
Returns the matrix natural logarithm of
This is not the same as calculating the natural
logarithm of each element. For information about the
calculation method, refer to
squareMatrix1
always contains floating-point numbers.
LnReg
MATH/Statistics/Regressions menu
[
list1 list2
LnReg , , [
Calculates the logarithmic regression and updates
all the system statistics variables.
All the lists must have equal dimensions except for
.
list5
represents xlist.
list1
represents ylist.
list2
represents frequency.
list3
represents category codes.
list4
represents category include list.
list5
Note:
list1
c1–c99 (columns in the last data variable shown in
the Data/Matrix Editor).
variable name and cannot be c1–c99.
Local
CATALOG
var1 var2
Local [, ] [,
Declares the specified
variables exist only during evaluation of a program
or function and are deleted when the program or
function finishes execution.
Note: Local variables save memory because they
only exist temporarily. Also, they do not disturb any
existing global variable values. Local variables must
be used for
values in a multi-line function since modifications on
global variables are not allowed in a function.
Lock
CATALOG
var1 var2 ]
Lock [, ...
Locks the specified variables. This prevents you
from accidentally deleting or changing the variable
without first using the unlock instruction on that
variable.
In the example to the right, the variable L1 is locked
and cannot be deleted or modified.
Note: The variables can be unlocked using the
command.
Unlock
812
squareMatrix
on.
cos()
must be diagonalizable. The result
]
list3 list4 list5
] [, , ]
through must be a variable name or
list4
does not have to be a
list5
var3 ...
]
as local variables. Those
vars
loops and for temporarily saving
For
In Radian angle mode and Rectangular complex
format mode:
.
squareMatrix1
ln([1,5,3;4,2,1;6,ë 2,1]) ¸

1.831...+1.734...øi .009...ì 1.490...øi

.448...ì.725...øi

ë.266...ì 2.083...øi 1.124...+1.790...øi ...
In function graphing mode:
{1,2,3,4,5,6,7,8}! L1 ¸
{1,2,2,3,3,3,4,4}! L2 ¸
LnReg L1,L2 ¸
ShowStat ¸
¸
Regeq(x)"y1(x) ¸
NewPlot 1,1,L1,L2 ¸
¥ %
Program listing:
:prgmname()
:Prgm
:Local x,y
:Input "Enter x",x
:Input "Enter y",y
:Disp xù y
:EndPrgm
Note: x and y do not exist after the program
executes.
{1,2,3,4}! L1 ¸
Lock L1 ¸
DelVar L1 ¸
Error: Variable is locked or protected
Appendix A: Functions and Instructions

...

1.064...+.623øi ...

{1 2 3 ... }
{1 2 2 ... }
Done
Done
Done
{1,2,3,4}
Done