Appendix A: Functions and Instructions 463
8992APPA.DOC TI-89 / TI-92 Plus: Appendix A (US English) Susan Gullord Revised: 02/23/01 1:48 PM Printed: 02/23/01 2:21 PM Page 463 of 132
list4mat() MATH/List menu
list4mat(list [, elementsPerRow]) ⇒ matrix
Returns a matrix filled row-by-row with the
elements from list.
elementsPerRow, if included, specifies the
number of elements per row. Default is the
number of elements in list (one row).
If list does not fill the resulting matrix, zeros
are added.
list4mat({1,2,3}) ¸[1 2 3]
list4mat({1,2,3,4,5},2) ¸
1
2
3 4
5 0
@list() MATH/List menu
list(list1) ⇒ list
Returns a list containing the differences
between consecutive elements in list1. Each
element of list1 is subtracted from the next
element of list1. The resulting list is always
one element shorter than the original list1.
@list({20,30,45,70}) ¸
{1
0,
1
5,25
}
ln() TI-89: 2x key TI-92 Plus: x key
ln(expression1) ⇒ expression
ln(list1) ⇒ list
Returns the natural logarithm of the
argument.
For a list, returns the natural logarithms of
the elements.
ln(2.0) ¸.693...
If complex format mode is REAL:
ln({ë3,1.2,5}) ¸
Error: Non-rea
l
resu
l
t
If complex format mode is RECTANGULAR:
ln({ë3,1.2,5}) ¸
{ln(3) + pøi .182... ln(5)}
ln(squareMatrix1) ⇒ squareMatrix
Returns the matrix natural logarithm of
squareMatrix1. This is not the same as
calculating the natural logarithm of each
element. For information about the
calculation method, refer to cos() on.
squareMatrix1 must be diagonalizable. The
result always contains floating-point
numbers.
In Radian angle mode and Rectangular
complex format mode:
ln([1,5,3;4,2,1;6,ë2,1]) ¸
1.831…+1.734…øi .009…ì1.490…øi …
.448…ì.725…øi 1.064…+.623øi …
ë.266…ì2.083…øi 1.124…+1.790…øi …