### IV. Math Menu

D. 4:Matrix

 Press . Use and to select the menu of choice.

Not all options are given in the entry format. Options that are used frequently will be included, but others are omitted from the table. For a complete format listing, you can check the TI-89 manual. Results in complex mode are not covered. They can be found in the manual.
NOTE: Some of the operations of the Matrix menu are not shown below. Refer to your manual for instructions on those operations.

 Operation Entry Format Explanation Screen 1:(Transpose) matrix1 Returns the complex conjugate transpose of matrix1. You must name the matrix first. Use the and keys to name the matrix. 2:det det(squareMatrix) Returns the determinant of squareMatrix. 3:ref ref(matrix1) Returns the row echelon form of matrix1. 4:rref rref(matrix1) Returns the reduced row echelon form of matrix1. 5:simult simult(coefMatrix,constVector) Returns a column vector that contains the solutions to a system of linear equations. 6:identity identity(expression) Returns the identity matrix with a dimension of expression. 7:augment augment(list1,list2) Returns a new list that is list2 appended to the end of list1. J:Row ops 1:rowSwap rowSwap(matrix1,rIndex1,rIndex2) Swaps the indicated rows. J:Row ops 2:rowAdd rowAdd(matrix1,rIndex1,rIndex2) Replaces rIndex2 with the sum of rIndex1 and rIndex2. J:Row ops 3:mRow mRow(expression, matrix1,index) Multiplies the row "index", by the expression. J:Row ops 4:mRowAdd mRowAdd(expression, matrix1,index1,index2) Multiplies row "index1", adds that to row "index2", and replaces row "index2" with the result. K:Element ops 1:.+ matrix1 .+ matrix2 expression .+ matrix1 matrix1 .+ matrix2 returns a matrix that is the sum of corresponding elements. K:Element ops 2:.- matrix1 .- matrix2 expression .- matrix1 matrix1 .- matrix2 returns a matrix that is the difference of corresponding elements. K:Element ops 3:.* matrix1 .* matrix2 expression .* matrix1 matrix1 .* matrix2 returns a matrix that is the product of corresponding elements. K:Element ops 4:./ matrix1 ./ matrix2 expression ./ matrix1 matrix1 .+ matrix2 returns a matrix that is the quotient of corresponding elements. K:Element ops 5:.^ matrix1 .^ matrix2 expression .^ matrix1 matrix1 .+ matrix2 returns a matrix that is the exponent of corresponding elements. L:Vector ops 1:unitV unitV(vector1) Returns a unit vector L:Vector ops 2:crossP crossP(list1,list2) crossP(vector1,vector2) Returns the cross product. L:Vector ops 3:dotP dotP(list1,list2) dotP(vector1,vector2) Returns the dot product.

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