valr: Genome Interval Arithmetic

globalVariables(c(
  "chrom", "start", "end", "strand",
  ".exon_num", ".exon_size", ".exon_start",
  "name", ".prev_end", "size",
  "max.end", "size_mean", "int_est", ".starts", ".ends", ".row",
  ".start", ".end", ".size", ".strand",
  "start.x", "end.x", "strand.x",
  "start.y", "strand.x", "strand.y",
  ".overlap", ".id", ".value", ".win_num",
  ".facet", ".id_merge", ".overlap_merge",
  ".end.x", ".start.x", "CHROM", "POS", "REF",
  ".counts", "exon_sizes",
  ".absdist", ".ref_gap", ".ref_points",
  "exon_starts", "key", "left_end", "left_start", "pos",
  ".reldist", "right_end",
  "right_start", ".total", "value",
  ".midpoint", ".obs_counts", ".length",
  ".reference_coverage", ".total_trials", ".exp_prob",
  "p.value", ".win_size", ".row_id",
  "cds_start", "cds_end", "score",
  "n_int", "sum_overlap", "sum_x", "sum_xy", "sum_y",
  "temp_start", "temp_end", "seqnames", ".depth"
))