Hello, I have a list having granges as follows:

$File1.bed

GRanges object with 3 ranges and 2 metadata columns:

      seqnames    ranges strand |        name     score

         <Rle> <IRanges>  <Rle> | <character> <numeric>

  [1]    chr1   [ 4,  6]      + |         TF1         0

  [2]     chr1  [ 9,  9]      + |         TF1         0

  [3]     chr1  [11, 12]      - |         TF1         0

  -------

  seqinfo: 2 sequences from an unspecified genome; no seqlengths

$File1.bed

GRanges object with 3 ranges and 2 metadata columns:

      seqnames    ranges strand |        name     score

         <Rle> <IRanges>  <Rle> | <character> <numeric>

  [1]    chr2   [ 5, 60]      + |         TF4         0

  [2]     chr1  [21, 90]      + |         TF4         0

  [3]     chr2  [23, 30]      - |         TF4         0

  -------

  seqinfo: 3 sequences from an unspecified genome; no seqlengths

I would like to make these lists one list, to concatenate them into one.

I tried doing 

do.call("c",list)

but it would not work, however when I do the following it works:

c(list[[1]],list[[2]])

I am looking for a command that can concatenate them without me having to right it manually.

This is the final result I am looking for:

GRanges object with 6 ranges and 2 metadata columns:
      seqnames    ranges strand |        name     score
         <Rle> <IRanges>  <Rle> | <character> <numeric>
  [1]    chr1   [ 4,  6]      + |         TF1         0
  [2]     chr1  [ 9,  9]      + |         TF1         0
  [3]     chr1  [11, 12]      - |         TF1         0
  [4]    chr1   [ 4,  6]      + |         TF4         0
  [5]     chr1  [ 9,  9]      + |         TF4         0
  [6]     chr1  [11, 12]      - |         TF4         0
  -------
  seqinfo: 2 sequences from an unspecified genome; no seqlengths

Any thoughts?

You can use do.call if you convert to a GRangesList first.

> glst <- list(GRanges(paste0("chr", 1:5), IRanges(1:5, 7:11)),GRanges(paste0("chr", 5:1), IRanges(1:5, 7:11)), GRanges(paste0("chr", c(2,3,4,1,5)), IRanges(1:5, 7:11)))
> glst
[[1]]
GRanges object with 5 ranges and 0 metadata columns:
      seqnames    ranges strand
         <Rle> <IRanges>  <Rle>
  [1]     chr1       1-7      *
  [2]     chr2       2-8      *
  [3]     chr3       3-9      *
  [4]     chr4      4-10      *
  [5]     chr5      5-11      *
  -------
  seqinfo: 5 sequences from an unspecified genome; no seqlengths

[[2]]
GRanges object with 5 ranges and 0 metadata columns:
      seqnames    ranges strand
         <Rle> <IRanges>  <Rle>
  [1]     chr5       1-7      *
  [2]     chr4       2-8      *
  [3]     chr3       3-9      *
  [4]     chr2      4-10      *
  [5]     chr1      5-11      *
  -------
  seqinfo: 5 sequences from an unspecified genome; no seqlengths

[[3]]
GRanges object with 5 ranges and 0 metadata columns:
      seqnames    ranges strand
         <Rle> <IRanges>  <Rle>
  [1]     chr2       1-7      *
  [2]     chr3       2-8      *
  [3]     chr4       3-9      *
  [4]     chr1      4-10      *
  [5]     chr5      5-11      *
  -------
  seqinfo: 5 sequences from an unspecified genome; no seqlengths

> do.call(c, as(glst, "GRangesList"))
GRanges object with 15 ranges and 0 metadata columns:
       seqnames    ranges strand
          <Rle> <IRanges>  <Rle>
   [1]     chr1       1-7      *
   [2]     chr2       2-8      *
   [3]     chr3       3-9      *
   [4]     chr4      4-10      *
   [5]     chr5      5-11      *
   ...      ...       ...    ...
  [11]     chr2       1-7      *
  [12]     chr3       2-8      *
  [13]     chr4       3-9      *
  [14]     chr1      4-10      *
  [15]     chr5      5-11      *
  -------
  seqinfo: 5 sequences from an unspecified genome; no seqlengths
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