Texas Instruments TI-83 Guide Book

Matrices 10-15
8310MTRX.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:35 PM Printed: 02/19/01 1:36
PM Page 15 of 16
cumSum( returns cumulative sums of the elements in
matrix
, starting with the first element. Each element is the
cumulative sum of the column from top to bottom.
cumSum(
matrix
)
MATRX MATH
menu items A through F are row operations.
You can use a row operation in an expression. Row
operations do not change
matrix
in memory. You can
enter all row numbers and values as expressions. You can
select the matrix from the
MATRX NAMES
menu.
ref( (row-echelon form) returns the row-echelon form of a
real
matrix
. The number of columns must be greater than
or equal to the number of rows.
ref(
matrix
)
rref( (reduced row-echelon form) returns the reduced row-
echelon form of a real
matrix
. The number of columns must
be greater than or equal to the number of rows.
rref(
matrix
)
cumSum(
Row Operations
ref(, rref(

Texas Instruments TI-83 Specifications

General

Programming	TI-BASIC
Processor	Zilog Z80, 6 MHz
Weight	7.4 oz (210 g)
Display	96x64 pixels, monochrome LCD
Power Source	4 AAA batteries, 1 CR1616 or CR1620 for backup
Memory	32 KB RAM
Connectivity	2.5mm I/O port for linking with other TI calculators