112
When argument B
is
a multidimensional array,
the
[I] index
entry
is
used
to
specify
the
coordinate acted on. If
the
index
entry
is
omitted,
the
last coordinate (columns)
is
acted on.
If
the<D
tB
form
is
used,
the
first coordinate
is
acted on. Indexing along a
nonexistent coordinate will result
in
INDEX ERROR.
When argument B
is
a multidimensional array,
the
coordinate
of
argument B
that
is
acted
on
is
eliminated:
6
6
c·
'-'
5
o
1
B~"2
:3pt
B
t
")
':
..
3
1+
I!:'
·,,1
f.)
+/B
j
I::'
"-
.•
J
---------The
last coordinate (columns)
is
assumed;
+ I
I::
2::1
B therefore,
the
reduction
is
between columns:
:1.5
'7
9
'7
9
+fB
~
1+2+3=6
+ I
I:
1.
::I
B The second
coordinate
(in this case, columns)
~
is
specified.
B~"2
:.~
4'P\21+~
B The first coordinate (rows)
is
specified;
1')
,.
...
~:~
lJ.
therefore,
the
reduction
is
between rows:
I!:'
''''
6
"l B
<'I
:1.0
:1.1.
1.2
2
3
11~.
1.
~.)
:L
6
:1.7
:LB
:1.9
20
5
§.
7
§.
9
21
22
23
24·
+/[:l.JB
:1.6
:L
B 2
o--------The
first
coordinate
22
21+
2(~)
20
~:~
0
32
3
1
4.
36
IH·
\ 0
B
+/1'3
::::/B
(planes)
is
specified;
therefore,
the
reduction
is
between planes.
riB
-'7
I
;?':37E7~.:i
If argument B
is
an array
that
has a coordinate whose dimension
is
zero,
then
reduc-
tion
along
that
coordinate yields an array whose elements are equal
to
the
identity
element
for
the
function.
The
identity
element
for
each function
is
given
in
the
preceding table.
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