1. RE: 3 dimension array
This is such a great forum. Many thanks for the prompt replies.
I believe that the below example creates an equivalent to DIM
somearray(3,7,4). No need to reply unless I am wrong. I know I have to
break from the shackles of BASIC but during the transition the analogy
to the mindset of BASIC will help me.
C. K. Lester wrote:
> > >> a = 3
> > >> b = 7
> > >> c = 4
> > >> somearray = repeat(repeat(repeat(0,c),b),a)
> >
> > > This will need to be made into a recursive function, I'm sure... :)
> >
> > The example I gave works. Why "need to"?
>
> In case he wants more than 3 dimensions (as he mentioned in his original
> post)...
>
>
2. Re: RE: 3 dimension array
22/08/2002 8:43:53 AM, darceman <darce at ffi.com> wrote:
>
>This is such a great forum. Many thanks for the prompt replies.
It is, isn't it.
>I believe that the below example creates an equivalent to DIM
>somearray(3,7,4). No need to reply unless I am wrong. I know I have to
>break from the shackles of BASIC but during the transition the analogy
>to the mindset of BASIC will help me.
>
One huge difference between BASIC and Euphoria is that in Euphoria all arrays
are dynamic. In that
the number of dimensions can be changed at will through out the life of the
array.
Here is one attempt at a function that emulates BASIC's DIM array command.
function DIMArray( sequence Dimension, object InitValue )
sequence lNewArray
if length(Dimension) = 0 then
return 0
end if
lNewArray = InitValue
for i = length(Dimension) to 1 by -1 do
if integer(Dimension[i]) then
lNewArray = repeat(lNewArray, Dimension[i])
else
return i
end if
end for
return lNewArray
end function
It can be used like this:
object Space3D
Space3D = DIMArray( {3, 7, 4}, 0)
if integer(Space3D) then
ErrAbort(sprintf("All dimensions must be integers; dimension %d is not.",
Space3D))
end if
Then elements can be reference like:
Space3D[1][1][1] = 2
Space3D[2][3][1] = "Euphoria rocks!"
------------
cheers,
Derek.
3. RE: 3 dimension array
> > In case he wants more than 3 dimensions (as he mentioned in his original
> > post)...
>
> I disagree for several reasons.
>
> 1) With the same method I used (_without_ recursion), you can create
> arrays with say 100 dimensions if you like, just by nesting repeat()
> 100 times, instead of 3 times.
I agree. But I'm always looking for the lazy way out... and if circumstances
or requirements "might" change in the future, I like to plan for that at the
outset.
> 2) It's not a matter of the number of dimensions one wants, the main
> question is, if
> a) the number of dimensions is known at "compile" time (then a
> "static" approach like mine will be OK for any number of
> dimensions), or
> b) the number of dimensions is dynamically provided at runtime.
>
> 3) For case 2b), my approach does not work, but he didn't describe that
> situation in his question.
> And even in case 2b), recursion is not needed, simple iteration will
> be sufficient to dimension the array:
Agreed... I should have said "recursion or iteration." :)
