Merge a list of clonal evolution trees (given by the clonal evolution tree data frames) in multiple samples into a single clonal evolution tree, and label the leaf nodes (identified in individual tree) with the corresponding samples in the merged tree.
# S3 method for clone.trees
merge(trees, samples = NULL, sample.groups = NULL,
merge.similar.samples = FALSE)a list of clonal evolution trees' data frames
name of samples that will be used in node labels
named vector of sample grouping
drop a sample if there is already another sample with the same tree