[plt-scheme] nested vectors

Yes, this is good (more than acceptable).

Chongkai

e wrote:
> is something like this an acceptable approach?  (just teat a linear 
> array like a 2d array).  seems like a better version of this stuff is 
> probably part of the included stuff, I would imagine.  Like there's 
> probably a way to get the size of a vector.  I was going to make a 
> (array-2d-print) function, too that displays it like a grid ..... 
> maybe tomorrow.  Any suggested improvements or directions are of 
> course welcome.
>
> (define (make-array-2d size initial)
>   (make-vector (* size size) initial))
>
> (define (array-2d-ref array size row col)
>   (vector-ref array (+ (* row size) col)))
>
> (define (array-2d-set! array size row col value)
>   (vector-set! array (+ (* row size) col)))
>
> > (define deposits (make-array-2d 17 0))
>
> > (array-2d-ref deposits 17 0 11)
> 0
>
> > (array-2d-set! deposits 17 0 11 39)
>
> > (array-2d-ref deposits 17 0 11)
> 39
>
>
>
> On Sat, Feb 14, 2009 at 4:40 PM, Chongkai Zhu <czhu at cs.utah.edu 
> <mailto:czhu at cs.utah.edu>> wrote:
>
>     and every slot of the vector is filled with `fill'. In your
>
>