access_GR.r

gr[1:2]
#GRanges object with 2 ranges and 1 metadata column:
#      seqnames         ranges strand |              score
#         <Rle>      <IRanges>  <Rle> |          <numeric>
#  [1]     chr1 [  130,   379]      + | 0.0297835641540587
#  [2]     chr1 [30050, 31349]      + |   0.42395940516144
#  -------
#  seqinfo: 3 sequences from an unspecified genome; no seqlengths

start(gr)
#[1]   130 30050  4509 69098

end(gr)
#[1]   379 31349  4908 69687

width(gr)
#[1]  250 1300  400  590

seqnames(gr)
#factor-Rle of length 4 with 3 runs
#  Lengths:    2    1    1
#  Values : chr1 chr2 chrX
#Levels(3): chr1 chr2 chrX

values(gr)
#DataFrame with 4 rows and 1 column
#       score
#   <numeric>
#1 0.02978356
#2 0.42395941
#3 0.11233843
#4 0.80039317