148
FUNCTION EDITING
Several
methods
are used
when
in
function
definition
mode
to
display
and
revise
a user-defined
function.
Also,
after
a
function
definition
has
been
closed,
the
definition
can be
reopened
and
the
same
methods
used
for
further
revisions
or
displays. (See Reopening Function Definition in
this
chapter.)
Displaying a User-Defined Function
Once in
function
definition
mode,
part
or
all
of
a user-defined
function
can be
displayed
as
follows:
•
To
display
the
entire
function,
including
the
function
header
and
the
opening
and
closing V ,
enter
[0].
APL
responds
by
displaying
the
function,
then
wait-
ing
for
the
entry
of
additional
statements.
•
To
display from a specified
statement
to
the
end
of
the
function,
enter
[On],
where
n
is
the
specified
statement
number.
APL
responds
by
displaying
the
function
from
statement
n
to
the
end
of
the
function,
then
waiting
for
the
last
statement
displayed
to
be
edited
(see Editing Statements in
this
chapter).
•
To
display
only
one
statement
of
the
function,
enter
[nO],
where
n
is
the
statement
number
to
be displayed. APL responds
by
displaying
statement
n
and
waiting
for
the
statement
to
be
edited
(see Editing Statements in
this
chapter).
The
following
table
summarizes
function
display
when
in
function
definition
mode:
Entry
[nO]
[On]
[0]
Result
Displays
statement
n
Displays all
statements
from
n
onward
Displays all
statements
Revising a User-Defined Function
Statements
in
a user-defined
function
can be replaced,
added,
inserted,
deleted,
or
edited
as follows:
•
To
replace
statement
number
n,
enter
[n]
and
the
replacement
statement.
If
just
[n]
is
entered,
APL
responds
with
[n],
then
waits
for
the
replacement
statement
to
be
entered.
If
the
function
header
is
to
be replaced,
enter
[0]
and
the
new
function
header.
•
To
add
a
statement,
enter
[n]
(n
can be
any
statement
number
beyond
the
last existing
statement
number)
and
the
new
statement.
APL
will respond
with
the
next
statement
number,
and
additional
statements
can be
entered
if
required.
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