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55
What is Manual Calculation
?
The
COMPUTER
may
be
basically used
in
two
ways.
One
way
lets you
store i
n
advance the whole
calculation
procedure or steps into the computer's memory as a
program,
then lets the
computer automatically execute it
later.
The
other
lets
you
calculate
step
by
step
through
manual
key operations. The
latter
is
called a
manual
cal
c
ulation.
Of
course,
in
the
CAL
mode,
all
calculations are
performed
manually, but here
onl
y
those performed in
the BASIC mode
(RUN
or
PROgram mode) are called manual
calculations.
Manual Calculatio ns in BASIC Mode
Error
Message
Cause
of Error
IMPOSSIBLE
•
Matrixes do not match in
size.
CALCULATION
Matrixes
do
not
match
i
n
size
in addition,
subtrac-
tion,
or
multiplication, or
an
attempt was
made to
calculate
the inverse
matrix, or to perform the
squaring,
of
a matrix
which
is not a square
matrix.
MEMORY OVER
•
Insufficient
memory
In
X
-7
M operation, memory
space is
not
enough
to
store
matrix
M,
or no
work
area
is available
for
arithmetic
operation.
DIVISION
BY ZERO
•
0 (zero)
is
used
as
divisor.
In an inverse matrix
calculation,
an attempt
was
made to
divide
a
number
by
zero.
OVER
FLOW
•
Overflow has
occurred
during
an
arithmetic oper-
ation.
Error
Messages
If an error
occurs during the
calculation
of
a
matrix,
one
of
the following
messages
appears on the display, together with the
"E" (Error) sign.
Press the
~
key to
release
the
COMPUTER from the error condition
and
the
"E"
sign
will
go
off
and the
message "MATRIX
OPERATION"
will
appear
on the
display.
At this
point,
the
matrix
data before the execution of the matrix
calculation
is retained
in
memory.
Using as a Calculator
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- Basic Commands
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