# Element - `Þa`

- Adjacency matrix (Directed)

## Description

Adjacency matrix of directed graph (nonzero A_ij denotes edge from i to j)

## Overloads

`lst`

-`adjacency matrix of directed graph (where a = [[i, j] for each edge i to j])`

## Examples

`⟨⟨1|5⟩|⟨2|4⟩|⟨3|4⟩|⟨4|4⟩⟩ Þa`

=`⟨⟨0|0|0|0|1⟩|⟨0|0|0|1|0⟩|⟨0|0|0|1|0⟩|⟨0|0|0|1|0⟩|⟨0|0|0|0|0⟩⟩`

`⟨⟩ Þa`

=`⟨⟨0⟩⟩`