Re: multi-dim arrays in c

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

 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. 
>