i. 10
0 1 2 3 4 5 6 7 8 9
   i. 20
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
   >: 3
4
   i. >: 20
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
   (i. >: 20)%20
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1
   3*(i. >: 20)%20
0 0.15 0.3 0.45 0.6 0.75 0.9 1.05 1.2 1.35 1.5 1.65 1.8 1.95 2.1 2.25 2.4 2.55 2.7 2.85 3
   _0.5 + 3*(i. >: 20)%20
_0.5 _0.35 _0.2 _0.05 0.1 0.25 0.4 0.55 0.7 0.85 1 1.15 1.3 1.45 1.6 1.75 1.9 2.05 2.2 2.35 2.5
   foo =: 3 : 0
'a b n' =. y
a,b,n
)
   foo _0.5 2.5 20
_0.5 2.5 20
   'a b' =. 2 3 4
|length error: lecture
|   'a b'    =.2 3 4
|[-12] history-20080925
   'a b' =. 2 3 
   a
2
   b
3
   'a b' =. 2 ;3
   a
2
   'a b' =. 2 ;'now is the time'
   a
2
   b
now is the time
   bar =: 3 : 'y+1'
   bar
3 : 'y+1'
   bar1 =: 13 : 'y+1'
   bar1
1 + ]
   >:
>:
   bar1 =: 13 : '1+y'
   bar1
1 + ]
   foo2 =: +/ * 3
   foo2 i. 5
1
   foo2 0
|syntax error
|       foo2 0
|[-30] history-20080925
   foo2
1
   foo3 +/ * (3"_)
foo3 (+/ * 3"_)
   foo3=: +/ * (3"_)
   foo3
+/ * 3"_
   foo3 0 1 2
9
   foo3 0 1 2 4
21
   ave =: +/ % #
   ave i. 2 3 4
 6  7  8  9
10 11 12 13
14 15 16 17
    i. 2 3 4
 0  1  2  3
 4  5  6  7
 8  9 10 11

12 13 14 15
16 17 18 19
20 21 22 23
   ave"1 i. 2 3 4
 1.5  5.5  9.5
13.5 17.5 21.5
   ave"2 i. 2 3 4
 4  5  6  7
16 17 18 19
   define
 :0
   each
&.>
   each_j_
&.>
   +/ each 1 2 3; 4 5 6;7 8 9 0
+-+--+--+
|6|15|24|
+-+--+--+
   bc=:<"
   0 bc i. 10
+-+-+-+-+-+-+-+-+-+-+
|0|1|2|3|4|5|6|7|8|9|
+-+-+-+-+-+-+-+-+-+-+
   1 bc i. 10
+-------------------+
|0 1 2 3 4 5 6 7 8 9|
+-------------------+
   2 bc i. 10
+-------------------+
|0 1 2 3 4 5 6 7 8 9|
+-------------------+
   0 bc i. 2 3
+-+-+-+
|0|1|2|
+-+-+-+
|3|4|5|
+-+-+-+
   1 bc i. 2 3
+-----+-----+
|0 1 2|3 4 5|
+-----+-----+
   2 bc i. 2 3
+-----+
|0 1 2|
|3 4 5|
+-----+
   \ i. 10
|syntax error
|       \i.10
|[-53] history-20080925
   +\ i. 10
0 0 0 0 0 0 0 0 0 0
0 1 0 0 0 0 0 0 0 0
0 1 2 0 0 0 0 0 0 0
0 1 2 3 0 0 0 0 0 0
0 1 2 3 4 0 0 0 0 0
0 1 2 3 4 5 0 0 0 0
0 1 2 3 4 5 6 0 0 0
0 1 2 3 4 5 6 7 0 0
0 1 2 3 4 5 6 7 8 0
0 1 2 3 4 5 6 7 8 9
   +\ 10
10
   +\ 9 10
9  0
9 10
   is =: /\
   + is 1 2 3 4 5
1 3 6 10 15