<div dir="ltr"><div class="markdown-here-wrapper" style=""><p style="margin:0px 0px 1.2em!important">Hi Vicky,<br>as usual you are fantastic. Thank you</p>
<p style="margin:0px 0px 1.2em!important">On Tue, 22 May 2018 at 02:36, Vicky Vergara <a href="http://mailto:vicky@georepublic.de">vicky@georepublic.de</a> wrote:</p>
<p style="margin:0px 0px 1.2em!important"></p><div class="markdown-here-exclude"><p></p><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><br></div><div><span style="font-family:monospace,monospace"><br></span></div><div><span style="font-family:monospace,monospace">SELECT ogc_fid as id, source, target, st_length(wkb_geometry) <br>test1tmp-# as cost FROM linee;<br> id | source | target | cost <br>----+--------+--------+------------------<br> 1 | 1 | 2 | 1875.88794100276<br> 2 | 3 | 1 | 1551.56248158866<br> 3 | 1 | 4 | 1506.74402481746<br> 4 | 4 | 5 | 1208.08883442544<br> 5 | 2 | 6 | 1447.12212188142<br>(5 rows)<br><br>test1tmp=#SELECT * FROM pgr_dijkstraCost('SELECT ogc_fid as id, source, target, st_length(wkb_geometry) <br> as "cost" FROM linee',1,ARRAY[2,3,4,5,6]);<br> start_vid | end_vid | agg_cost <br>-----------+---------+------------------<br> 1 | 2 | 1875.88794100276<br> 1 | 4 | 1506.74402481746<br> 1 | 5 | 2714.8328592429<br> 1 | 6 | 3323.01006288418<br>(4 rows)</span></div><div><span style="font-family:monospace,monospace"></span><span style="font-family:monospace,monospace"></span><br><span style="font-family:monospace,monospace"></span></div><div style="font-family:arial,helvetica,sans-serif">From the results, vertex 3 is never reached (end_vid does not have a 3)</div><div style="font-family:arial,helvetica,sans-serif"><br></div><div><span style="font-family:monospace,monospace">WITH unreach_vertex AS</span></div><div><span style="font-family:monospace,monospace"> (SELECT id FROM linee_vertices_pgr LEFT JOIN pgr_dijkstraCost('SELECT ogc_fid as id, source, target, st_length(wkb_geometry) <br> as "cost" FROM linee',1,ARRAY[2,3,4,5,6]) ON (end_vid = id) WHERE id !=1 AND end_vid IS NULL)<br>UPDATE linee set source = target, target = source WHERE source IN (SELECT id FROM unreach_vertex);<br>UPDATE 1<br>test1tmp=# SELECT * FROM pgr_dijkstraCost('SELECT ogc_fid as id, source, target, st_length(wkb_geometry) <br> as "cost" FROM linee',1,ARRAY[2,3,4,5,6]);<br> start_vid | end_vid | agg_cost <br>-----------+---------+------------------<br> 1 | 2 | 1875.88794100276<br> 1 | 3 | 1551.56248158866<br> 1 | 4 | 1506.74402481746<br> 1 | 5 | 2714.8328592429<br> 1 | 6 | 3323.01006288418<br>(5 rows)<br></span></div><div style="font-family:arial,helvetica,sans-serif"><br></div><div style="font-family:arial,helvetica,sans-serif"><br></div></div></blockquote><p></p></div><p style="margin:0px 0px 1.2em!important"></p>
<p style="margin:0px 0px 1.2em!important">This is a presente for me and I see some light :)</p>
<p style="margin:0px 0px 1.2em!important">But I was very interested to this your</p>
<blockquote style="margin:1.2em 0px;border-left:4px solid rgb(221,221,221);padding:0px 1em;color:rgb(119,119,119);quotes:none">
<p style="margin:0px 0px 1.2em!important">I dont know your data, but suppose<br> id = 1, source = A, target = B, cost > 0, reverse_cost = -1 and that vertex A is not reachable<br> then “manually” would be:<br> UPDATE TABLE foo set source = target, target = source WHERE source IS IN ()</p>
</blockquote>
<p style="margin:0px 0px 1.2em!important"> I understood that it was possible to have a negative cost, for the edge <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">2</code> of my example and starting from my data (my shapefile). A sort of direct way to have this negative cost.<br>Than to have that 3 was reacheable, but with negative cost. I’ve probably misunderstood it and it’s not like that</p>
<p style="margin:0px 0px 1.2em!important"></p><div class="markdown-here-exclude"><p></p><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div style="font-family:arial,helvetica,sans-serif"></div><div style="font-family:arial,helvetica,sans-serif"><br></div><div style="font-family:arial,helvetica,sans-serif">you still won me an explanation of :</div><div style="font-family:arial,helvetica,sans-serif"><br></div><div style="font-family:arial,helvetica,sans-serif">> Please, try to find out what I am doing wrong. (your answer will help see your current level of understanding of pgRouting)<br></div><br clear="all"></div></blockquote><p></p></div><p style="margin:0px 0px 1.2em!important"></p>
<p style="margin:0px 0px 1.2em!important">I will do it, but probably I’m a little dumb.</p>
<p style="margin:0px 0px 1.2em!important">Thank you again</p>
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bjwvc3Bhbj48L3NwYW4+PGJyPjwvZGl2PjwvZGl2Pjxicj4=" style="height:0;width:0;max-height:0;max-width:0;overflow:hidden;font-size:0em;padding:0;margin:0"></div></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><span style="font-size:small">___________________</span><br></div><div dir="ltr"><span style="font-size:small"><br></span></div><div dir="ltr">Andrea Borruso<br>
website: <a href="https://medium.com/tantotanto" target="_blank">https://medium.com/tantotanto</a><br>38° 7' 48" N, 13° 21' 9" E, EPSG:4326<br><span style="font-size:small">___________________</span><br>
<br>
"cercare e saper riconoscere chi e cosa,<br>
in mezzo all’inferno, non è inferno, <br>
e farlo durare, e dargli spazio"<br>
<br>
Italo Calvino<br></div></div></div></div></div></div></div></div></div></div></div></div></div></div>