greenteam - 1 year ago 82

Python Question

suppose I have a 2D list of booleans such as:

`[[False, True , False],`

[True, False, False]]

would it be possible to convert this into a graph such that all the adjacent vals of the list are connected to each other? adjacency meaning just another value either directly next to, above/under, or one diagonal space away from each other. I'm working on a problem that I think would be easier to accomplish with a graph but my input is a list and I was curious if there was a way of doing that?

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Answer Source

What exactly do you mean by 'convert into a graph'?

One possibility is for you to create a structure for representing the graph. I suggest you read the top answer to this question: Representing graphs (data structure) in Python

Then, you create the proper connections and create the graph.

This code assumes all sublists are of equal length and graph is undirected.

```
def getConnections(input_list):
connections = []
directions = [(-1,-1),(0,-1),(1,-1),(1,0)]
for i in range(0,len(input_list)):
for j in range(0,len(input_list[0])):
for x,y in directions:
if (i+y >= 0 and i+y < len(input_list) and j+x >= 0 and j+x < len(input_list))
pair = (input_list[i][j], input_list[i+y][j+x])
connections.append(pair)
return connections
myList = [[False, True , False], [True, False, False]]
connections = getConnections(myList)
myGraph = new Graph(connections, directed = false)
```

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