Numeric array and for loops problem
Chad Netzer
cnetzer at mail.arc.nasa.gov
Tue Jan 7 19:11:58 EST 2003
On Tuesday 07 January 2003 05:29, Stan wrote:
> worldarray[x,y] = val
> x += 1
> y += 1/2
> Doesn't work..
As others pointed out, 1/2 (currently) in python evaluates to 0 (integer
division truncation of the remainder).
However, if you wanted to increment y by a half, ie:
y += 0.5
then you'll find that you can't index into the array with a floating point
value. That is because indices are whole numbers, representing the order of
items, they are not a continuum.
You need to allocate your grid to the finest precision you will need, then
scale your indices appropriately. If you need both a HUGE grid, and a very
fine grid, you will run out of memory, and need to use techniques where you
are only operating on small subsets of the entire conceptual grid at any one
time.
Good luck with your project; it may be ambitious for a beginning programmer,
but you will learn a lot I expect.
--
Bay Area Python Interest Group - http://www.baypiggies.net/
Chad Netzer
cnetzer at mail.arc.nasa.gov
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