
Section 12: Calculating with Matrices 139
Deactivates Complex
mode.
Dimensions matrix A
to be 2×2.
Prepares for automatic
entry of matrix
elements in User mode.
(Turns on the USER
annunciator.)
Denotes matrix A, row
1, column 1. (A display
like this appears
momentarily as you
enter each element and
remains as long as you
hold the letter key.)
Dimensions matrix B to
be 2×l.
Designates matrix C
for storing the result.
Using matrix notation, the solution of the matrix equation AX = B is
X = A
-1
B
where A
1
is the inverse of matrix A. You can perform this operation by
B and A into the Y- and X-registers
and then pressing ÷. (A descriptor shows the name and dimensions of a
matrix.) Note that if A and B were numbers, you could calculate the answer
in a similar manner.
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