| Getting the biggest and smallest value from an array
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adder
msg:4545283 | 12:04 pm on Feb 13, 2013 (gmt 0) |
Hi guys,
I've got an array with X,Y coordinates. There will be variable number of coordinates depending on the object.
This is what the array looks like:
12, 34, 13, 42, 18, 43, 20, 36
The odd possition is always X and the even position is Y. In other words:
Xs are: 12, 13, 18, 20
Ys are: 34, 42, 43, 36
I'm looking for an output like this:
$Xmax = 20
$Xmin = 12
$Ymax = 43
$Ymin = 34
What would be the most sensible way of doing this?
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jatar_k
msg:4545347 | 4:08 pm on Feb 13, 2013 (gmt 0) |
you could quickly loop though the array and put them into 2 other arrays, one for x values and one for y values
then it's easy enough to sort [php.net] each array then just grab the first and last value of each
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adder
msg:4547633 | 8:57 pm on Feb 21, 2013 (gmt 0) |
@jatar_k, good idea, thank you. I ended up splitting it like this:
foreach($myarray as $key => $value)
{
if ($key&1)
{
unset($myarray[$key]);
}
}
$minX = min($myarray);
$maxX = max($myarray);
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swa66
msg:4547714 | 2:07 am on Feb 22, 2013 (gmt 0) |
Efficiency ... since you already walk through it: remember the lowest and highest yourself.
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astupidname
msg:4548296 | 3:46 am on Feb 24, 2013 (gmt 0) |
Or, to present another way, without looping:
$a = array(12, 34, 7.68966, -34.876, -65.8, -54.214, 87, 2);
preg_match_all('/(-?\d+\.?\d*)@(-?\d+\.?\d*)/', implode('@', $a), $coords);
//$coords[1] will be array containing all 'x' coordinates
//$coords[2] will be array containing all 'y' coordinates
$xmin = min($coords[1]);
$xmax = max($coords[1]);
$ymin = min($coords[2]);
$ymax = max($coords[2]);
echo "xmin = $xmin<br>xmax = $xmax<br>ymin = $ymin<br>ymax = $ymax"; |
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