If your C code is slow, a perl implementation will be even slower. What you need is a better data structure so you don't have to do a linear search over all codes, for example a quad tree. The module Tree::M
Update: I notice that your perl code uses a flat-geometric distance rather than a curved-earth great circle distance. That's probably good enough for typical geometric queries (like "50 miles from my house"). But you could do the same thing in the C program. You could also search using the distance squared and avoid all those square roots.
my $xdelta = $x1-$x2;
my $ydelta = $y1-$y2;
my $distance_squared = $xdelta*$xdelta + $ydelta*$ydelta;
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
Outside of code tags, you may need to use entities for some characters:
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||