Texas Instruments TITANIUM TI-89 - Manual (Page 839)

Appendix A: Functions and Instructions 839
log() CATALOG/ ¥ 7 key
log(expression1[,expression2])
⇒ expression
log(list1[,expression2]) ⇒ list
Returns the base- expression2 logarithm of the
argument.
For a list, returns the base- expression2 logarithm of
the elements.
If expression 2 is omitted, 10 is used as base.
log(2.0) ¸ .301 ...
If complex format mode is REAL :
log({ë 3,1.2,5}) ¸
Error: Non-real result
If complex format mode is RECTANGULAR :
log({ë 3,1.2,5}) ¸
{log(3)+ 1.364… ( i .079… log(5)}
log( squareMatrix1 )
⇒ ⇒ ⇒ ⇒ squareMatrix
Returns the matrix base- expression2 logarithm of
squareMatrix1 . This is not the same as calculating
the base- expression2 logarithm of each element.
For information about the calculation method,
refer to
cos() .
squareMatrix1 must be diagonalizable. The result
always contains floating-point numbers.
In Radian angle mode and Rectangular complex
format mode:
log([1,5,3;4,2,1;6,л2,1]) ¸





 .795…+.753…ш i .003…м.647…ш i …
.194…м.315…ш i .462…+.270ø i …
л .115…м.904…ш i .488…+.777…ø i …
log( x,b )
⇒ ⇒ ⇒ ⇒ expression
log( squareMatrix1 )
⇒ ⇒ ⇒ ⇒ squareMatrix
In a list, returns the base expression 2 logarithm of
the elements.
Log(10,3) – log(5,3) ¸ Log
3
(2)
Log(2.0,4)¸ .5
4444logbase
MATH/String menu
expression 4444logbase(expression1) ⇒ ⇒ ⇒ ⇒ expression
Causes the input expression to be
simplified to an expression using base
expression1
.
Log(10,3) – log(5,5) 4 logbase(5)
¸
) 3 ( log
) 30 ( log
5
5