[Jprogramming] Another newbie J question - generating a table from a monadic function

[Mikl Kurkov]

Glenn M. Lewis wrote:
> 
>    fn =. 3 : 0
> +/(1+i.y)^5
> )
>    fn 839
> 58340773411141200
> 
>     Now, I wish to make a table of all the values of 'fn' from 1 to 
> 1000...  Do I have to write a 'for' loop?
> 
>     Obviously, 'fn i. 1000' doesn't work and changing 'y' to "0 y in the 
> function also doesn't work because of the '+/'.
> 
Just use fn"0:
  fn"0 >: i. 1000 NB. if you want calc fn values from 1 to 1000 you should
use >: i.1000, not just i.1000

But you can get the same result more effectively:
  +/\(1+i.1000)^5

--
Mikl
-- 
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