Operation Manual

Chapter 10: Matrices 153
Note: You cannot copy a matrix output from the history.
Accessing a Matrix Element
On the home screen or from within a program, you can store a value to, or recall a value from, a matrix
element. The element must be within the currently defined matrix dimensions. Select
matrix from the
MATRX NAMES menu.
[matrix](row,column)
Using Math Functions with Matrices
Using Math Functions with Matrices
You can use many of the math functions on the TI-84 Plus C keypad, the MATH menu, the MATH NUM
menu, and the MATH TEST menu with matrices. However, the dimensions must be appropriate. Each of
the functions below creates a new matrix; the original matrix remains the same.
Addition, Subtraction, Multiplication
To add or subtract matrices, the dimensions must be the same. The answer is a matrix in which the
elements are the sum or difference of the individual corresponding elements.
matrixA+matrixB
matrixA
NmatrixB
To multiply two matrices together, the column dimension of matrixA must match the row dimension of
matrixB.
matrixA…matrixB