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53
[(No.
of
rows
of
matrix
X) x (No.
of
columns of
matrix
X) x 8
+
7]
bytes
+
[(No.
of rows
of
matrix
l')
x
(No.
of columns of matrix Y)
x
8
+
7] bytes
+
[No.
of rows
of
matrix M)
x
(No.
of
columns
of
matrix
M)
x
8
+
7]
bytes
+
[No.
of
rows
of
resultant matrix)
x (No.
of
columns
of resultant matrix)
x
8
+
7)
bytes
Memory Capacity Required for
Matrix
Calculations
•
Because
matrix calcul
a tions
share
the
same memory area as that
used
for BASIC
programs, unused memory capacity
(i.e.,
capacity determinable by
MEM
I
ENTER)
in BASIC
mode) must
be
larger than the
capacity determined by the
foll
o wing
formula:
So the results
obtained
by computers may
have such
an
error.
Please
note
that
verification
by any
other method
may be
required depending
on
how
matrix cal
c
ulations
will
be
applied.
In the
above example,
when you obtain
the
determinant
value by
multiply-
ing the
original
matrix
X by
3,
you can confirm
that matrix
Xis
not a regular
matrix
because the result
of
the
multiplicaiton becomes
0
{rn
~l
=O).
Note:
Because a matrix cal
c
ulation will not be completed
by
a single
operation (e.g.,
one-time
multiplication),
it
will
take some time
to complete the
calculation.
It will
take about 6 seconds to solve
for
the
inverse
matrix
of a
unit
matrix consisting of 7 rows and 7
columns.
This
calculation
time
varies depending on the values of
matrix el
e ments.
1.E10
J
-3.E10
1 J-1
= [-
13.3E.
1
.
.
03.
0.33
...
3
This matrix is
not
a
regular matrix and
thus has no inverse
matrix
theoretically.
With
any
computer,
however,
the
value
1/3 is
input
as
"0.33
.....
3"
and
thus
an
inverse matrix
exists,
resulting
in
the
following.
Example
5: To solve
for
the
inverse matrix
of
[ ~
Using as a
Calculator
- Quick Links:
- Basic Commands
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