You have a useful expression. It is not a verb.
a=:2 3 5
b=:0 1 2 3
4!:0 <'('''';,.a),.(b);a +/ b'
_2
A result of 3 would indicate a verb.
f=: 13 '('''';,.a),.(b);a +/ b'
|syntax error
| f=: 13'('''';,.a),.(b);a +/ b'
This doesn't work. Note however the use of a double '' for each ' inside
the outer pair.
Now use x and y only as replacements for the left and right arguments.
f=: 13 :'('''';,.x),.(y);x +/ y'
a f b
┌─┬───────┐
│ │0 1 2 3│
├─┼───────┤
│2│2 3 4 5│
│3│3 4 5 6│
│5│5 6 7 8│
└─┴───────┘
4!:0 <'f'
3
You have defined or made a verb. It is also often called a function.
You did the hard part when you created a simple expression that works! Creating
the verb is what makes it useful to use with other data.
Linda
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Björn Helgason
Sent: Sunday, November 20, 2011 8:09 AM
To: Programming forum
Subject: Re: [Jprogramming] table challenge in simple J
or
('';,.a),.(b);a +/ b
2011/11/20 Björn Helgason <[email protected]>
>
> Ok it is simple j we are after
> We start by defining a and b
>
> a=: 2 3 5
> b=: 0 1 2 3
>
> Then we create the elements we want
>
> '';b;a;a +/ b
> ┌┬───────┬─────┬───────┐
> ││0 1 2 3│2 3 5│2 3 4 5│
> ││ │ │3 4 5 6│
> ││ │ │5 6 7 8│
> └┴───────┴─────┴───────┘
>
> Now we rearrange a so it goes down in a column
>
> '';b;(,.a);a +/ b
> ┌┬───────┬─┬───────┐
> ││0 1 2 3│2│2 3 4 5│
> ││ │3│3 4 5 6│
> ││ │5│5 6 7 8│
> └┴───────┴─┴───────┘
>
> Next we arrange it in a 2 by 2
>
> ('';b),.(,.a);a +/ b
> ┌───────┬───────┐
> │ │2 │
> │ │3 │
> │ │5 │
> ├───────┼───────┤
> │0 1 2 3│2 3 4 5│
> │ │3 4 5 6│
> │ │5 6 7 8│
> └───────┴───────┘
>
> ooppss wrong wa around we fix it with transpose
>
>
> |:('';b),.(,.a);a +/ b
> ┌─┬───────┐
> │ │0 1 2 3│
> ├─┼───────┤
> │2│2 3 4 5│
> │3│3 4 5 6│
> │5│5 6 7 8│
> └─┴───────┘
>
>
--
Björn Helgason, Verkfræðingur
Fornustekkum II
781 Hornafirði,
t-póst: [email protected]
gsm: +3546985532
twitter: @flugfiskur
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/|_ .-----------------------------------.
,' .\ / | Með léttri lund verður |
,--' _,' | Dagurinn í dag |
/ / | Enn betri en gærdagurinn |
( -. | `-----------------------------------'
| ) | (\_ _/)
(`-. '--.) (='.'=) ♖♘♗♕♔♙
`. )----' (")_(") ☃☠
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