Texas Instruments PLUS TI-89 - Manual (Page 510)

Appendix A: Functions and Instructions 493
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 493 of 132
rowNorm () MATH/Matrix/Norms menu
rowNorm( matrix ) ⇒ expression
Returns the maximum of the sums of the
absolute values of the elements in the rows in
matrix .
Note: All matrix elements must simplify to
numbers. See also colNorm() .
rowNorm([-5,6,-7;3,4,9;9,-9,-7])
¸
25
rowSwap () MATH/Matrix/Row ops menu
rowSwap( matrix1 , rIndex1 , rIndex2 ) ⇒ matrix
Returns matrix1 with rows rIndex1 and
rIndex2 exchanged.
[1,2;3,4;5,6]! Mat ¸



 1 2
3 4
5 6
rowSwap(Mat,1,3) ¸



 5 6
3 4
1 2
RplcPic CATALOG
RplcPic picVar [, row][ , column ]
Clears the Graph screen and places picture
picVar at pixel coordinates ( row , column ). If
you do not want to clear the screen, use
RclPic .
picVar must be a picture data type variable.
row and column , if included, specify the pixel
coordinates of the upper left corner of the
picture. Default coordinates are (0, 0).
Note: For less than full-screen pictures, only
the area affected by the new picture is
cleared.
rref() MATH/Matrix menu
rref( matrix1[ , tol] ) ⇒ matrix
Returns the reduced row echelon form of
matrix1 .
rref([л 2,л 2,0,л 6;1,л 1,9,л 9;
л 5,2,4,л 4]) ¸




1 0 0 66/71
0 1 0
147
71
0 0 1 л 62/71
Optionally, any matrix element is treated as
zero if its absolute value is less than
tol . This
tolerance is used only if the matrix has
floating-point entries and does not contain
any symbolic variables that have not been
assigned a value. Otherwise,
tol is ignored.
• If you use ¥ ¸ or set the mode to
Exact/Approx=APPROXIMATE , computations
are done using floating-point arithmetic.
•
If tol is omitted or not used, the default
tolerance is calculated as:
5 E л 14 щ max(dim( matrix1 ))
ù rowNorm( matrix1 )
Note: See also ref() .
rref([a,b,x;c,d,y]) ¸






1 0
dø x -bø y
aø d -bø c
0 1
ë (cø x-aø y)
aø d -bø c