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# Symmetrize

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###### Description

Sometimes we need to turn a directed network into an undirected one. This operation is called symmetrize. There are many ways to symmetrize, specially if you have a weighted network. Here we present the most simple ones

###### Parameters
• Treat graph as a matrix (instead of an edgelist) will be treated as zero or the empty string. Any edges set to entirely zero or the empty string will be removed.
• Symmetrize by Maximum (max) When you symmetrize by maximum you consider each edge and replace its value for the direction which is higher. For example, let us say that the edge (Mark,Peter) has a value of 3 and (Peter,Mark) has a value of 2. Here you will replace both these edges by an undirected edge with a value of 3. In the case of a simple graph (no weights) the algorithm turns every directed edge into an undirected one.
• Symmetrize by Minimum (min) When you symmetrize by minimum you consider each edge and replace its value for the direction which is lower. For example, let us say that the edge (Mark,Peter) has a value of 3 and (Peter,Mark) has a value of 2. Here you will replace both these edges by an undirected edge with a value of 2. In the case of a simple graph (no weights) the algorithm removes all unreciprocal links (removes all links that go only in one direction).
###### See Also

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