Convert a matrix or column-sparse matrix to a list of edges and nodes for
use by `graphjs`

.

1 | ```
matrix2graph(M)
``` |

`M` |
either a matrix or any of the possible column sparse matrix objects from the Matrix package. |

A list with node and edges data frame entries used by `graphjs`

.

Numeric graphs are assumed to be weighted and the edge "size" values are set to the corresponding matrix entries.

`graphjs`

, `graph2Matrix`

1 2 3 | ```
data(LeMis)
M <- graph2Matrix(LeMis$edges, LeMis$nodes)
G <- matrix2graph(M)
``` |

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