Here are the commands for checking your work on Gaussian elimination using a TI-83 calcuclator or the Maple software package (available in campus computer labs).

Entering a matrix
TI-83:

• Hit the MATRIX button.
• Use the right arrow to choose EDIT, hit ENTER to edit matrix A.
• Enter the number of rows, columns, and the entries.

• Type with(linalg): to load the linear algebra package.
• Type A:=matrix(m,n,[a_11,a_12,...,a_mn]); to enter an mxn matrix A with entries a_11,a_12,...,a_mn, reading across the rows (or choose to View the Matrix Palette and then click on the appropriately sized matrix and fill in the question marks).
• (The semicolon at the end may be necessary to get Maple to execute the command.  Consult the Help pages for more details.)

Doing row operations
 

Row Operation	TI-83	Maple
	Hit MATRIX, right arrow to MATH Up arrow to options F,E,C Use MATRIX, NAMES to enter matrix in option below	Assign these to a new name using A1:= etc. or use % to stand for result of prior computation.
O(i,j;r)	F:*row(r,[A],j,i)	addrow(A,j,i,r);
Om(i;r)	E:*row(r,[A],i)	mulrow(A,i,r);
Op(i,j)	C:rowSwap([A],i,j)	swaprow(A,i,j);

***Note the difference in the order of the indices in the commands for O(i,j;r)--the number of the row you are changing goes second.***