"-") in a sample of DNA
sequences.del.gaps(x)
del.colgapsonly(x)del.colgapsonly.del.gaps returns a vector (if there is only one input sequence)
or a list of class "DNAbin"; del.colgapsonly returns a
matrix.del.gaps remove all gaps, so the returned sequences may not
have all the same lengths and are therefore returned in a list. del.colgapsonly removes the columns that contain only gaps
(useful when a small matrix is extracted from a large alignment).
The sequences can be either in "DNAbin" or in another format,
but the returned object is always of class "DNAbin".
base.freq, GC.content,
seg.sites, image.DNAbin