Re: multi-dim arrays in c

["Ruben Safir Secretary NYLXS" <user=91@nabble.blu.org>]

 On Fri, Aug 29, 2008 at 08:16:35PM -0400, Ruben Safir wrote: 
> On Fri, Aug 29, 2008 at 05:43:40PM -0400, Stephen Adler wrote: 
> > Guys, 
> > 
> > I've got a standard c coding question which has been nagging me for a 
> > while and I was wondering what you guys may think or have the correct 
> > solution to this problem.... 
> > 
> > Lets say I have a 2 dim array of data and the dimension sizes can change 
> > depending on the specific data set. I can read in the x and y dimensions 
> > from a file, then read in the x*y elements of the data a populate a 
> > memory area x*y*elementsizeinbytes with the data. But now I want to 
> > access the data. Without doing pointer arithmatic, is it possible to use 
> > the standard [][] notation somehow? 
> > 
> > for example 
> > 
> >    int *data; 
> >    x=getXDim(); 
> >    y=getYDim(); 
> >    data=(int *)malloc(x*y*sizeof(int)); 
> >    readInData(x,y,data); 
> >    printf("Middle data element is %d\n",data[y][x]); 
> > 
> > but I know that that data[y][x] will barf on the compiler because the 
> > compiler has no way of knowing what the y size of the "y" dimension is... 
> > 
> > Any suggestions on how to use the N-dimensional bracket notation in this 
> > situation? 
> > 
> > Thanks. 
> > 
>