[Jprogramming] problem

[Raul Miller]

On Fri, Aug 28, 2009 at 4:39 AM, Sherlock, Ric<R.G.Sherlock at massey.ac.nz> wrote:
> I'm not convinced that this solution meets the spec given for the RosettaCode problem "Basic bitmap storage"
> http://rosettacode.org/wiki/Basic_bitmap_storage
>
>   allocimg=:  0 $~ 3 ,~ ]
>   fillimg=: ]`(a:"_)`[}
>   setpix=: (1&{::@])`([: <@;/ <:@(0&{::@]))`[}
>   getpix=: <@;/@:<:@] { [
>
>   myimg=: allocimg 10 7           NB. 10 by 7 pixel image
>   myimg=: myimg fillimg 0 255 0   NB. fill with green
>   myimg getpix 4 5                NB. get color of pixel from 4th row and 5th col
> 0 255 0
>   myimg=: myimg setpix 4 5; 255 0 255  NB. set pixel to magenta
>   myimg getpix 4 5                NB. verify
> 255 0 255
>
> I'm thinking that I probably need to pass the name rather than the value of the image object?

I see nothing in the specs even suggesting that call by value should
not be used.

-- 
Raul