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Full Discussion: problem with c++ find, find_if
Top Forums Programming problem with c++ find, find_if Post 302579840 by LMHmedchem on Tuesday 6th of December 2011 08:35:13 PM
Old 12-06-2011
problem with c++ find, find_if
I am trying to search a vector for something, and it I find it, do something.

I have this so far,
Code:
vector<vector<int> >::iterator path_iterator;
vector<int>::iterator path_iterator;
vector<int> check_path;

   // to each path1[i], try to add a neighbor of last_vertex
   for(j=0; j<last_vertex_delta; j++) {
      current_neighbor = vertex_list[last_vertex_in_path].neighbor_nums[j];

      // copy from vec<vec<int>> to temp vec, probably not necessary
      check_path = new_set_of_paths[path_count];

      // search path to see if current_neighbor is already part of path
      path_iterator = find_if(check_path.begin(),
                              check_path.end(),
                              current_neighbor);

      cout << "last_atom_in_path " << last_atom_in_path << endl;
      cout << "current_neighbor " << current_neighbor << endl;
      cout << "path_iterator " << * path_iterator << endl;
      cout << endl;

      // if the neighbor isn't already part of the path, add it
      if(path_iterator == check_path.end()) {
         new_set_of_paths[path_count].push_back( current_neighbor );
         path_count ++;
      }

      check_path.clear();
   }

The if(path_iterator == check_path.end()) line isn't kosher. If I remember how find_if works, you send the third argument to a function that returns a bool and find_if returns the first value where the bool function returns true. True in this context would mean that the value is already in the vector, so it seems like the bool function has to do the heavy lifting here. I'm not sure what the bool function should look like and why I can just use find and have it return an iterator to the position of anything that matches current_neighbor.

I tried that,
Code:
      path_iterator = find(check_path.begin(),
                           check_path.end(),
                           current_neighbor);

      cout << "last_atom_in_path " << last_atom_in_path << endl;
      cout << "current_neighbor " << current_neighbor << endl;
      cout << "path_iterator " << * path_iterator << endl;
      cout << endl;

      // if the neighbor isn't alreay part of the path, add it
      if(path_iterator == 0) {
         new_set_of_paths[path_count].push_back( current_neighbor );
         path_count ++;
      }

but this doesn't work either. If I print *path_iterator, it prints as 0 when the vertex isn't found in the vector, but I can't seem to evaluate the iterator that way.

Any suggestions as to what I have wrong here?

LMHmedchem
 

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LEARN ABOUT DEBIAN

vecscreen

VECSCREEN(1)						     NCBI Tools User's Manual						      VECSCREEN(1)

NAME

       vecscreen - find nucleic acid segments of possible vector origin

SYNOPSIS

       vecscreen [-] [-d str] [-f N] [-i filename] [-o filename]

DESCRIPTION

       vecscreen is a system for quickly identifying segments of a nucleic acid sequence that may be of vector origin. NCBI developed vecscreen to
       minimize the incidence and impact of vector contamination in public sequence databases. GenBank Annotation Staff use  vecscreen	to  verify
       that sequences submitted for inclusion in the database are free from contaminating vector sequence. Any sequence can be screened for vector
       contamination using vecscreen.

       vecscreen searches a query for segments that match any sequence in a specialized non-redundant vector database (UniVec).  The  search  uses
       BLAST  with  parameters	preset	for optimal detection of vector contamination. Those segments of the query that match vector sequences are
       categorized according to the strength of the match, and their locations are displayed (see example positive result).

       vecscreen is designed to quickly check a nucleic acid sequence for the presence of vector contamination and to show which  segments  within
       the  sequence  may  be  of  vector  origin. Although a vecscreen search against UniVec will not identify the vector that is the most likely
       source of the contamination, this can usually be deduced from the cloning history of the sequenced DNA.

OPTIONS

       A summary of options is included below.

       -      Print usage message

       -d str Database (default = UniVec)

       -f N   Output format:
	      0      HTML format, with alignments (default)
	      1      HTML format, no alignments
	      2      Text list, with alignments
	      3      Text list, no alignments

       -i filename
	      Query File (default = stdin)

       -o filename
	      VecScreen report Output File (default = stdout)

AUTHOR

       The National Center for Biotechnology Information.

SEE ALSO

       <http://www.ncbi.nlm.nih.gov/VecScreen/VecScreen_docs.html>

NCBI
								    2001-10-05							      VECSCREEN(1)
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