simplegraph | memory Graph Database/Cache : learn | Database library
kandi X-RAY | simplegraph Summary
kandi X-RAY | simplegraph Summary
A really Simple, rudimentary Graph (in-memory) DB implemented in Java. Can be used as an application cache storage, and is really fast. But mainly this is meant for people (students?) that want to find out how a graph database works, by looking at code instead of reading books. The SimpleGraph is implemented as a TripleStore, containing tuples (well, actually triples) of Subject, Object and Predicate. For more info on Triplestores, check here:
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Top functions reviewed by kandi - BETA
- The test test program
- Generate sample graph for a sample
- Perform a query
- Adds bindings to the bindings map
- Add an object
- Add to the index
- Adds a subject and object to the index
- Gets the object registered with the given subject ID
- Get the triples for a given subject and object
- Check whether a predicate evaluates to true
- Indicates whether the given object exists
- Return true if predicate is true
- Returns true if the given subject exists
simplegraph Key Features
simplegraph Examples and Code Snippets
Community Discussions
Trending Discussions on simplegraph
QUESTION
When I try to calculate the betweenness_centrality()
of my SimpleWeightedGraph with julia's LightGraphs package it runs indefinitely. It keeps on increasing it's RAM usage until at some point it crashes without an error message. Is the something wrong with my graph? Or what would be the best way to find the cause of this problem?
My graphs are not generated by LightGraphs but by another library, FlashWeave. I'm don't know if that matters...
The problem does not occur for unweighted SimpleGraph's or for the weighted graph I created in LightGraphs...
...ANSWER
Answered 2021-Feb-19 at 19:58Did you check if your graph contains negative weights? LightGraphs.betweenness_centrality()
uses Dijkstra's shortest paths to calculate betweenness centrality, and thus expect non-negative weights.
LightGraphs.betweenness_centrality()
doesn't check for illegal/nonsensical graphs. That's why it didn't throw an error. The issue is already reported here, but for now, check your own graphs if your not sure they are legal.
QUESTION
I am new to Julia and LightGraphs and I have been trying to find the most efficient way of detecting and removing self-loops. So far, the only way I have found is to iterate over all nodes in the Simplegraph, check whether it has a self-loop, and remove them. Is there any better way like using this combination in Python NetworkX: G.remove_edges_from(G.selfloop_edges())
?
The way I am doing it right now:
...ANSWER
Answered 2021-Jan-08 at 16:01that's probably the best way to do it conditionally, but you can just call rem_edge!(G, node, node)
without the has_edge()
check - it returns a bool indicating whether the edge was removed so is safe to use if there's not an actual edge there.
QUESTION
I am trying to use depth first search starting from a particular vertex. For that I need to supply a visitor and a color map.
If I don't supply a starting vertex then I don't need to supply a color map either and everything works fine. However, I didn't find a signature that would accept a starting vertex without requiring a color map.
I use C++ 17 (Embarcadero C++ Builder) Here is the code:
...ANSWER
Answered 2020-Dec-09 at 13:20By wrapping your visitor in boost::visitor
you are confusing with the named-parameter overload. Just pass the visitor:
QUESTION
I am using jgrapht
in Java
to work a network-based algorithm. I first read an adjacency list and then create jgrapht
based graph. Now, given a subset of nodes called subNodes
, I'd like to generate a sub graph. I am trying to use Subgraph
class as shown at this link, however, I could not have it worked.
ANSWER
Answered 2020-Sep-24 at 17:01It seems you are referring to some old javadoc. Not sure why you are specifically using the 1.1.0. Here's an example using the 1.5 version of jgrapht:
QUESTION
I have a connected graph A (level 0) and I want to populate the next level with graphs B,C,D... by iteratively removing one edge at a time in A. Here is how my code begins:
...ANSWER
Answered 2020-Sep-23 at 10:07Thanks to the discussion on this question (here), I was able to come up with a solution to my problem. I took the same approach as in the thread and decided to 'blacklist' each edge individually:
QUESTION
Let G=(V,E)
be an undirected graph. I'd like to create an induced sub graph for a given subset of nodes U
with JgraphT
in Java.
Here is an adjacency list.
...ANSWER
Answered 2020-May-26 at 04:53To create induced subgraphs in JGraphT, use the MaskSubgraph or AsSubgraph classes. In your particular usecase, use the AsSubgraph:
QUESTION
I have made a JAR from SimpleGraph which I want to use it in a separat project. In my own project I can see and use the direct classes of SimpleGraph like ExcelSystem etc. but can not use the underlying classes as Vertex etc. from Tinkerpop/Gremlin. Is there a way to include these into the JAR generation?
...ANSWER
Answered 2020-Feb-17 at 17:48The installation instructions at http://www.bitplan.com/index.php/SimpleGraph-Installation have been updated according to your question.
To include simplegraph as a single jar dependency for your project you might want to run:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install simplegraph
You can use simplegraph like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the simplegraph component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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