diagram
What is the symbol for a queue?
I don’t know if this is canonical but, does this count? Also here are examples of queues in SDL-88 http://www.sdl-forum.org/sdl88tutorial/4.ProcessCommunication/4.1_Signal_input_queue.htm
How to generate dependency graph with text [closed]
graphviz is a tool for generating graphs. webgraphviz.com is a web app that uses graphviz, and lets you modify the text and display the corresponding graph (it has 5 samples/examples as well). graphviz takes input like this: digraph G { A->B }
constructor with parameters in UML class diagram
The common way is to write constructors like methods and simply omit the return type. If you want to be extra clear, you can add <<constructor>> in front.
Django – Model graphic representation (ERD) [closed]
If you want to extract UML diagram from your Django models you can use the Graph models command of django-extensions. Another one that do mostly the same thing: django-graphviz. If you want to create your Django models from UML: uml-to-django. And to create UML diagrams, there’s Dia, yED and ArgoUML You can check also this … Read more
Easiest algorithm of Voronoi diagram to implement? [closed]
An easy algorithm to compute the Delaunay triangulation of a point set is flipping edges. Since a Delaunay triangulation is the dual graph of a Voronoi diagram, you can construct the diagram from the triangulation in linear time. Unfortunately, the worst case running time of the flipping approach is O(n^2). Better algorithms such as Fortune’s … Read more
Sankey Diagrams in R?
This plot can be created through the networkD3 package. It allows you to create interactive sankey diagrams. Here you can find an example. I also added a screenshot so you have an idea what it looks like. # Load package library(networkD3) # Load energy projection data # Load energy projection data URL <- paste0( “https://cdn.rawgit.com/christophergandrud/networkD3/”, … Read more
Tools for creating Class Diagrams [closed]
I use GenMyModel, first released in 2013. It’s a real UML modeler, not a drawing tool. Your diagrams are UML-compliant, generate code and can be exported as UML/XMI files. It’s web-based and free so it matches your criteria.
Why is a database always represented with a cylinder? [closed]
I’m reasonably certain that it predates disk drives, and goes back to a considerably older technology: drum memory: Another possibility (or maybe the choice was based on both) is a still older technology: mercury tank memory: You may have seen the symbol oriented horizontally instead of vertically, but horizontal drums were common as well: