This function can convert a raw score matrix returned by nblast
into a square distance matrix or `dist`

object. It can be used with
file-backed matrices as well as regular R matrices resident in memory.

1 2 | ```
sub_dist_mat(neuron_names, scoremat = NULL, form = c("matrix", "dist"),
maxneurons = NA)
``` |

`neuron_names` |
character vector of neuron identifiers. |

`scoremat` |
score matrix to use (see |

`form` |
the type of object to return. |

`maxneurons` |
set this to a sensible value to avoid loading huge (order N^2) distances directly into memory. |

Note that if `neuron_names`

is missing then the rownames of
`scoremat`

will be used i.e. all neuron in scoremat will be used.

return An object of class matrix or dist (as determined by the form argument), corresponding to a subset of the distance matrix

Other scoremats: `nhclust`

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