I want to find a free , simple and powerful software to draw graph structure and mark on it easily. (just like some graph appear on some tutorials ) Any recommendation? Thank you very much!
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For many years, I haven't found any software better than MS Paint.
Graphviz
And online version: http://graphviz-dev.appspot.com/
Is there any way to add costs to the edges?
Something like that:
a -> b [label=50](DOT language)Thank you! I also notice that you can also put color on the edges.
highly recommend yEd. Easy to use, WYSIWYG, cross-platform, etc.
Very nice , thank you finally a good graph drawer
MS Paint
Today I found draw.io unintentionally, and I realize that it is very useful, and easy to use.
And it is easy to download PNG file format: