[Lemon-user] GraphReader format problems

[D Haley]

Hello,

I am having some troubles with the graphreader class, using lemon 1.2.1 on x86-64 installed from the opensuse repositories. I am attempting to read a graph using the following line (condensed):

 ifstream file("graph.txt");

 lemon::GraphReader<Graph>(g,file).nodeMap("values",m).run();

It appears I am not laying out the file as expected -- I have looked at this link (http://lemon.cs.elte.hu/pub/doc/1.2.1/a00002.html), but cannot see where I am going wrong -- any ideas? I don't want any map on top of my edges, just on the nodes themselves.



When I run the above code, I get the following error:
Breakpoint 5, lemon::GraphReader<lemon::ListGraph>::readEdges (
    this=0x7fffffffdc20) at /usr/include/lemon/lgf_reader.h:1868
1868	      while (readLine() && line >> c && c != '@') {
(gdb) 
1869	        line.putback(c);
(gdb) 
1871	        std::string source_token;
(gdb) 
1872	        std::string target_token;
(gdb) 
1874	        if (!_reader_bits::readToken(line, source_token))
(gdb) 
1877	        if (!_reader_bits::readToken(line, target_token))
(gdb) 
1880	        std::vector<std::string> tokens(map_num);
(gdb) 
1881	        for (int i = 0; i < map_num; ++i) {
(gdb) 

Breakpoint 3, lemon::GraphReader<lemon::ListGraph>::readEdges (
    this=0x7fffffffdc20) at /usr/include/lemon/lgf_reader.h:1882
1882	          if (!_reader_bits::readToken(line, tokens[i])) {
(gdb) 
1883	            std::ostringstream msg;
(gdb) 
1884	            msg << "Column not found (" << i + 1 << ")";
(gdb) 
1885	            throw FormatError(msg.str());
(gdb) 

Running again:
 
1882	          if (!_reader_bits::readToken(line, tokens[i])) {
(gdb) info locals
i = 0
source_token = "1"
target_token = "3"
tokens = std::vector of length 2, capacity 2 = {"", ""}
e = {id = -136536224}
map_index = std::vector of length 0, capacity 0
map_num = 2
label_index = -1
c = 49 '1'

graph.txt contents:

@nodes
label  values
    1    20 
    2    -4 
    3     0 
    4     0 
    5     9 
    6    -6 
    7     0 
    8     0 
    9     3 
   10    -2 
   11     0 
   12   -20 
                
@arcs
 
 1  2
 1  3
 1  4
 2  8
 3  5
 4  6
 4  7
 4  8
 5  7
 5 11
 6  3
 6  9
 6 10
 7  1
 8 12
 9 12
10 12
10  2
10  7
11 10
12 11