Text - Canon Cat Reference Manual

How Calculation-in-Context Works
[CALC]
evaluates
calculations throughout
the
text. Ifthe
highlight
is
not
extended,
a
single use
of
ICALC]
re-
evaluates
all
the expressions
in
the entire
text.
This re-
evaluation is called
recalc. While recalc is taking place,
the
cursor stops
flashing
and the
CALC
sign
appears on
the
ruler.
Ifyou
have a large
text
with
a
lot
ofcalculations,
a
recalc
may take some
time, but
it
can be
intemrpted by pressing
any
key.
This
causes
a
beep.
[EXPLAIN] says that the
calculation was
interrupted
and consequently
your
results
may
be
incorrect. It
also explains that
you may
complete
the calculation
by
using
[cALc]
again
without
extending
the
highlight.
When
you give
[CALC], one
or
more
of
the following
actions takes
place, depending
on
whether the
highlight
is
extended,
where the highlight
is
located, and what
is
contained
in
the
highlight:
Recalc
Ifthe highlight
is
not extended and
is
on
ordinary
text or an
unpocketed result (unpocketed
means an expression has
been taken
out
of its
pocket
and made
visible on
the
screen),
the Cat
re-evaluates
all
the expressions
in
the
entire
text. All
unpocketed expressions
will
automatically
be
pocketed
(see
automatic pocketing below).
Unpocketing
If
the
highlight
is on
a
pocketed result and is not extended,
the expression associated
with
that result
is
unpocketed,
that is,
brought
out
of its pocket and inserted
into
the
text
after the
result.
It
will
have
a dotted underline. An
underscore
separates
the result
from
the
unpocketed
ex-
pression.
Pressing both
LEAP keys
will
highlight
the
unpocketed expression so
it
can
quickly
be erased.
Pocketing
Ifthe highlight
is
extended,
and
there
are
no results
inside
the
highlight,
the Cat
attempts
to
calculate the
text
and
pocket
it. Ifthe
text cannot be
calculated
the Cat beeps,
and
the
highlight
collapses
on the
first part of
the expression
that the Cat
could not
understand.
Multiple pocketing
You
can pocket more than one expression
at a
time,
providing
the
expressions that
you're pocketing
are sepa-
rated
by
a
break character
or a
tab.
Highlight all
the
expressions, then use
[CALC].
[CALC]
will
process them
one
after another from
the
beginning to
the
end,
pocketing
them
in
sequence
as
it goes.
The extended
highlight must
contain
only
expressions, break characters and tabs.