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The
y
value
in
a
relative
address
refers
to the
vertical
distance
in
lines
from
the
expression
you
are
typing. A
positive
y
value
means
"down."
A
negative
y
value
means
"up."
Thus if
y is
"2,"
the
number
to be used is
in the second
line down from the
expression
you
are
typing.
If
the
numbr
you
want is on the
same
line,
then
y
-
0.
When
y
=
0,
you
can
omit it,
as
shown in
the
third
example
below:
Operator
Example
Meaning
use(x
y)
use(3
-2)
Use the
entry in
the
3rd
column to
the
right
of
this
expression, 2nd
row
up
Use
the
entry
in
this
column,
one
row down
[Xy] [0 1]
usedisplay(x
y)
usedisplay(-2)
Use the
displayed
value (not
the
underly-
ing
value,
which
is
more precise)
two col-
umns
to
the
left.
The
.r
and
y
values
must be
numbers;
they
cannot
be
expressions. They
must
also be separated
by
one
or more
spaces.
Do
not
use
a
perrnanent
space
to
separate
-r
and
y.
The
[x
y/
form
for relative
address
is
provided
for
key-
boards
that
have square brackets
(not
all
keyboards
pro-
vide
brackets).
The expression usedisplay(x
y)
is
similar
to
sumdisplay
in
that it
uses
the
displayed value rather
than the
more precise
underlying
value.
The
location
referred
to
by
a
relative
address
must
contain
an
expression.
If
it
doesn't,
the
result
will
read ????.
Typing in
an
expression
at
the
proper
location
will
correct
the
problem.
Pockets
When
you
[CALC]
an
expression,
the
text of
the
expression
disappears
from
the
screen,
and the Cat hides the expres-
sion
in
a
pocket. The result
of
the
calculation
appears
in
place
of
the
expression. You
can erase the
pocket
only by
erasing the entire result.
The result
has
a
nonprinting
dotted
underline.
The dotted
underline remains
attached
to
the
individual digits,
so
if
you
move
part
of
a
result away
from
the
pocket,
the
part
you
move remains
underlined. The next time you
use
[CALC],
the underline
will
disappear
from
the
part
you
moved.
The result
at the
point
it
was moved
from
will
be
restored. This
is because
you did not
change the
pocketed
expression, so
[CALC]
produced the
same
result
again.
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