find_order: Find clustering order using TSP algorithm.
In charliex210/sctools: Tools for single cell RNAseq analysis

Determine the order of by solving travel saleman problem.

1 2	find_order(mat, labels, reverse = FALSE, metric = "pearson", method = "farthest_insertion", seed = 1)

`mat`	Expression matrix, columns are cells and rows are genes.
`labels`	Cluster labels on the row of mat.
`reverse`	Reverse the path.
`metric`	Metric used to compute the paired distance - default is pearson correlation distance.
`method`	Method to solve the TSP, see `solve_TSP`.
`seed`	Random seed.