[GRASS-dev] question about the concept 'window'

[Peng Du]

  I see.

Just out of curiosity, why is get_map_column not provided? Lack of time 
or some infrastructure/performance consideration?

Thanks,
Peng

On 7/19/2010 10:24 PM, Hamish wrote:
> Peng Du wrote:
>> Another question: is there any function similar to
>> get_map_row(…) but gets a column of data from raster image
>> rather than a row?
> no. you'd have to load the whole map into memory for that, which
> is no good for very large maps.
>
> if you do have to do a lot of operations with full rows, and
> your maps are very big, you might consider to rotate the map by
> 90 degrees (AFAIR there's a contrib/ module in GRASS 4 or 5 to
> do that) or use r.out.mat to load the data into Matlab/Octave
> whos native array layout is by rows not columns (Fortran style).
> (but again they probably want to hold the whole array in memory)
>
> Hamish
>
>
>