[Jprogramming] tactic programming

[Mike Day]

Dear J Language

Raul's is what you want if you're happy with
an explicit answer. However, if by "tactic"
you mean "tacit" then this might be what you
want.

NB. Given
   open  =: 100 101 103 104 103 102
   close =: 101 100 104 104 105 103
  
NB. make a 2-row matrix using ,: "laminate"
   open (,:)close   
100 101 103 104 103 102
101 100 104 104 105 103
  
NB. study use  of u/. "oblique" ...
   open (%//.@:,:)close 
100 1 1.03 1 0.990385 0.971429 103

NB. clean up ends if you need to ...
   open (}.@}:@(%//.@:,:))close
1 1.03 1 0.990385 0.971429

NB. If the quotes are columns in a table,
NB. eg (for your example) ...
   tab=:(open,.close)1 4}"1(100+?6 5$ 6)

NB. you can do this sort of thing...
  (}.@}:@(%//.)@:|:)1 4 {"1 tab
1 1.03 1 0.990385 0.971429

Mike



Raul Miller wrote:
> On 6/7/07, j.language at antelecom.net <j.language at antelecom.net> wrote:
>> Given:
>> open =: 100 101 103 104 103 102
>> close =: 101 100 104 104 105 103
>> how about
>> +/ open(index+1) % close(index)
>
> Perhaps you mean
>   +/ (}.open) % }:close
> ?
>
> If not, could you specify more precisely what it is that
> you mean?
>
> Thanks,
>