dtw_rank: ranking genes with dtw
In strayMat/lineageDE: Differentially expressed genes in cell lineages

Compute a ranking of a list of genes based on the dynamic time warping distance between two lineages.

1 2	dtw_rank(data, reg.f = "loess", span = 0.75, s.df = 4, window.type = "none", window.size = 50, equal.size = NULL)

`data`	a `warpDEDataSet` with genes to be ranked.
`reg.f`	a function to perform regression, either "ns" for natural splines, "loess" or "splines" (default is "loess").
`span`	numeric, a smoothing parameter for the regression function (default is 0.75, see `gam::lo` for details).
`s.df`	numeric, a smoothing parameter for the nsplines regregression (default is 4, see `splines::s` for details about regularization).
`window.size`	integer, the size of the warping window (default is 50), see details.
`equal.size`	integer, if we want to specify the same number of points for each lineage to compute the dtw distance with (default is NULL, we use all points available in each lineage).
`gene`	character, a gene of interest.
`norm`	character,("L2" or "L1") the norm to be used for the dtw distance (default is "L2")