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• The two matrices must have the same dimensions in order to be added or
subtracted. An error occurs if you try to add or subtract matrices of different
dimensions.
• For multiplication, the number of columns in Matrix 1 must match the number of
rows in Matrix 2. Otherwise, an error occurs.
•You can use an identity matrix in place of Matrix 1 or Matrix 2 in the matrix
arithmetic format. Use the matrix command menu’s Identity command (1)
to input the identity matrix.
Example 3 To multiply Matrix A (from Example 1) by a 2 × 2 identity matrix
1(Mat)aA*
6(g)1(Iden)cw
Number of rows and columns.
kk
kk
k Matrix Scalar Multiplication
The following is the format for calculating a matrix scalar multiplication, which
multiplies the value in each cell of the matrix by the same value.
Scalar value Matrix
Mat A
k w
Mat Z
MatAns
Example Calculate the product of the following matrix using a multiplier
value of 4 :
Matrix A =
12
34
e1(Mat)aAw
kk
kk
k Determinant
Matrix
Mat A
3 (Det) w
Mat Z
MatAns
Matrix Calculations 6 - 4
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