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<div class=Section1>
<p class=MsoNormal><span lang=EN-GB>Hi again,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>I managed to get this Function to compile
and actually work. What I changed were the values in the expand to pass
to the functions give_source() and give_target().<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>I have made a quick OpenLayers + Mapserver script
so as to test the outcome and unfortunately this function is giving me really
awkward results!<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>The more the accident happens near to a
hospital / firestation, the less chance it will be chosen as the nearest
hospital / firestation.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>As one can test for himself, here :
http://yancho.no-ip.org/~yancho/rescue.html the nearer (I even tried on
the same street) the lesser the chance to be chosen as the nearest hospital.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>The new function can be found here : <a
href="http://yancho.pastebin.com/d37f3b903">http://yancho.pastebin.com/d37f3b903</a><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>The PHP script I am using for routing can
be found here : <a href="http://yancho.pastebin.com/f6cff7908">http://yancho.pastebin.com/f6cff7908</a><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>Any help how I can fix this problem will be
extremely appreciated!<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>Thanks and regards<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>Matthew <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Matthew Pulis
[mailto:mpulis@gmail.com] <br>
<b>Sent:</b> Thursday, December 06, 2007 9:41 PM<br>
<b>To:</b> 'Matthew Pulis'; 'PostGIS Users Discussion'<br>
<b>Subject:</b> RE: Improving the timing of a function<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Hi again,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Thanks to those who already
tried to help me I have put some RAISE NOTICE and here is the result :<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>This is the pastebin of the new
code : <a href="http://yancho.pastebin.com/f2f986b8c">http://yancho.pastebin.com/f2f986b8c</a>
<- marked with yellow are the new RAISE NOTICEs<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Below please find the result :<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>filling up the
hospital_location with that query took : 32646ms <o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>the IF section
took 994 ms<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>returning back to
the FOR loop took : 104 ms<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo4'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Shooting Star
execution took : 25079ms<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo4'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>If statement took :
614ms<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo4'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Shooting star took :
37927 ms<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo4'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>If took : 300 ms<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Total query runtime: 114250 ms.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>2 rows retrieved.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Execution plan :<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: Entering the FOR
IN Thu Dec 06 21:02:46.267488 2007 CET<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: entering shooting
star Thu Dec 06 21:02:46.300164 2007 CET<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: before IF Thu Dec
06 21:03:24.307906 2007 CET<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: value of
nearest.dist is 585.966565014107<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: value of
hospital.gid is 12712<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: value of
nearest.gid is <NULL><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: value of 2ND
nearest.gid is POINT(640607.6248615 224673.124400562)<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: after if Thu Dec
06 21:03:24.308900 2007 CET<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: before end of loop
Thu Dec 06 21:03:24.309029 2007 CET<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: entering shooting
star Thu Dec 06 21:03:24.309133 2007 CET<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: before IF Thu Dec
06 21:04:02.024339 2007 CET<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: value of
nearest.dist is 91.0322939509899<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: value of
hospital.gid is 38600<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: value of
nearest.gid is POINT(640607.6248615 224673.124400562)<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: value of 2ND
nearest.gid is POINT(640952.4998615 224309.563400563)<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: after if Thu Dec 06
21:04:02.024953 2007 CET<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: before end of loop
Thu Dec 06 21:04:02.025093 2007 CET<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: entering shooting
star Thu Dec 06 21:04:02.025178 2007 CET<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: before IF Thu Dec
06 21:04:39.952201 2007 CET<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: after if Thu Dec
06 21:04:39.952510 2007 CET<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: before end of loop
Thu Dec 06 21:04:39.952598 2007 CET<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>NOTICE: after end of loop
before returning Thu Dec 06 21:04:39.952846 2007 CET<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Total query runtime: 114250 ms.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>2 rows retrieved.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I hope this can help better </span><span
style='font-family:Wingdings;color:#1F497D'>J</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Thanks<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Matthew Pulis
[mailto:mpulis@gmail.com] <br>
<b>Sent:</b> Thursday, December 06, 2007 8:31 PM<br>
<b>To:</b> 'PostGIS Users Discussion'<br>
<b>Subject:</b> Improving the timing of a function<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Hi,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I added this function to find
the nearest hospital using the distance covered on the route itself. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>My reasoning was this :<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:20.25pt;text-indent:-18.0pt;
mso-list:l2 level1 lfo6'><![if !supportLists]><span style='color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Find the 3 most near
hospitals using distance() function</span><o:p></o:p></p>
<p class=MsoListParagraph style='margin-left:20.25pt;text-indent:-18.0pt;
mso-list:l2 level1 lfo6'><![if !supportLists]><span style='color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Iterate the 3
hospitals and find the one which is the shortest distance taking into
considerations one-ways et al. using shootingstar_sp() pgRouting Function.</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Using Pastebin I have pasted my
current function and also inline commented more on the function<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>At the end of the paste you can
find the EXPLAIN ANALYZE of the query.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Paste can be found here : <a
href="http://yancho.pastebin.com/f3cca3a41">http://yancho.pastebin.com/f3cca3a41</a><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>May I point out that I tried the
first SELECT query without LIMIT 3 and it gave me 52 points in 32ms and with
LIMIT 3 it gave me the 3 points in 31 ms.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Any help would be extremely
appreciated </span><span style='font-family:Wingdings;color:#1F497D'>J</span><span
style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Thanks and regards<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Matthew Pulis</span> <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
<div class=MsoNormal align=center style='text-align:center'><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'>
<hr size=2 width="100%" align=center>
</span></div>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>I
am using the free version of SPAMfighter for private users.<br>
It has removed 18467 spam emails to date.<br>
Paying users do not have this message in their emails.<br>
Try <a href="http://www.spamfighter.com/len">SPAMfighter</a> for free now!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
<div class=MsoNormal align=center style='text-align:center'><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'>
<hr size=2 width="100%" align=center>
</span></div>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>I
am using the free version of SPAMfighter for private users.<br>
It has removed 18467 spam emails to date.<br>
Paying users do not have this message in their emails.<br>
Try <a href="http://www.spamfighter.com/len">SPAMfighter</a> for free now!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
<div class=MsoNormal align=center style='text-align:center'><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'>
<hr size=2 width="100%" align=center>
</span></div>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>I
am using the free version of SPAMfighter for private users.<br>
It has removed 18467 spam emails to date.<br>
Paying users do not have this message in their emails.<br>
Try <a href="http://www.spamfighter.com/len">SPAMfighter</a> for free now!<o:p></o:p></span></p>
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