If they are of the same type, but different shape:
enshape=: ] , ($"_ _1~ $)
2 4 6 8 10 (+ recf -: +/[EMAIL PROTECTED]) i.2 2
1
--- Fraser Jackson <[EMAIL PROTECTED]> wrote:
> What is the simplest way of expressing the very commonly needed
> form of which the subject line is an example:
>
> a3 f a2 f a1 f m
>
> a list of items a =. a1, a2, a3, ... applied successively with a function f
> and a right argument m of a different shape or even of a different type.
> This occurs with any sequential updating process.
>
> The intermediate results are often of interest themselves. recf does what
> I want, but is there a neater way?
>
> recf=: 1 : 0
> :
> s =. y
> r =. ,:y
> for_i.
> i. # x
> do. s =. (i{x) u s
> r =. r,s
> end.
> r
> )
>
> 2 4 6 8 10 + recf i. 2 2
>
>
>
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
