Decomposes trinucleotide count matrix into signatures and contribution of those signatures to the spectra of the samples/vcf files.

1 | ```
extract_signatures(mut_matrix, rank, nrun = 200)
``` |

`mut_matrix` |
96 mutation count matrix |

`rank` |
Number of signatures to extract |

`nrun` |
Number of iterations, default = 200 |

Named list of mutation matrix, signatures and signature contribution

`mut_matrix`

1 2 3 4 5 6 | ```
## See the 'mut_matrix()' example for how we obtained the mutation matrix:
mut_mat <- readRDS(system.file("states/mut_mat_data.rds",
package="MutationalPatterns"))
## This function is computational intensive.
# nmf_res <- extract_signatures(mut_mat, rank = 2)
``` |

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