The following was written for the Casio FX-991 ES. If matrix
calculations are available on your calculator you will perform them as
described below. ( I have no time to verify that the FX-991ms can
perform matrix calculations).
Let me explain how to create matrices. (If you know how to do it, skip to the operations on matricies, at the end.)
First you must set Matrix calculation
[MODE][6:Matrix]. Then By entering one of the numbers [1:MatA] or
[2:Matb] or [3:MatC] you get to choose the dimensions of the matrix
(mxn]. Once finished entering the matrix you clear the screen.
The operations on matrices are available by pressing [Shift][Matrix]
[1:Dim] to change the dimension of a matrix (in fact redefining the
matrix)
[2:Data] enter values
in a matrix
[3:MatA] access Matrix A
[4:Matb] access Matrix B
[5:MatC] access matrix C
[6:MatAns] access the Answer Matrix (the last matrix calculated)
[7:det] Calculate the determinant of a matrix already defined
[8:Trn] The transpose of a matrix already defined
To add matrices MatA+MatB
To subtract MatA-MatB
To multiply MatAxMatB
To raise a matrixe to a power 2 [x2], cube [x3]
To obtain inverse of MatA already defined MatA[x-1] [x-1] is the x to
the power -1 key
Dimensions of matrices involved in operations must match.
Here is a short summary
The multiplication of structured mathematical entities (vectors, complex
numbers, matrices, etc.) is different from the multiplication of
unstructured (scalar) mathematical entities (regular umbers). As you
well know matrix multiplication is not commutative> This has to do
with the dimensions.
An mXn matrix has m rows and
n columns. To perform multiplication of an kXl matrice by
an mXn matrix you multiply each element in one row of the first
matrix by a specific element in a column of the second matrix. This
imposes a condition, namely that the number of columns of the first
matrix be equal to the number of rows of the second.
Thus, to be
able to multiply a kXl matrix by am mXn matrix, the number of columns of
the first (l) must be equal to the number of rows of the second (m).
So
MatA(kXl) * MatB(mXn) is possible only if l=m
MatA(kX3) *
Mat(3Xn) is possible and meaningful, but
Mat(kX3) * Mat(nX3) may not
be possible.
To get back to your calculation, make sure that the
number of columns of the first matrix is equal to the number of rows of
the second. If this condition is not satisfied, the calculator
returns a dimension error. The order of the matrices in the
multiplication is, shall we say, vital.
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