**20**wrote:

Dear BioStars,

I have a genomic ranges (GR) list object called "lgr.test" and would like to simply add several columns to its metadata. How would I do that? I have a list of numeric vectors "lvec.test" of the same lengths as the GRs in lgr.test.

Thank you!

```
> summary(lvec.test)
Length Class Mode
chr1 589 -none- numeric
chr2 790 -none- numeric
chr3 482 -none- numeric
chr4 681 -none- numeric
chr5 698 -none- numeric
chr6 492 -none- numeric
chr7 713 -none- numeric
chr8 489 -none- numeric
chr9 590 -none- numeric
chr10 521 -none- numeric
chr11 853 -none- numeric
chr12 395 -none- numeric
chr13 373 -none- numeric
chr14 358 -none- numeric
chr15 388 -none- numeric
chr16 340 -none- numeric
chr17 465 -none- numeric
chr18 287 -none- numeric
chr19 357 -none- numeric
```

`> summary(lgr.test)`

```
Length Class Mode
chr1 589 GRanges S4
chr2 790 GRanges S4
chr3 482 GRanges S4
chr4 681 GRanges S4
chr5 698 GRanges S4
chr6 492 GRanges S4
chr7 713 GRanges S4
chr8 489 GRanges S4
chr9 590 GRanges S4
chr10 521 GRanges S4
chr11 853 GRanges S4
chr12 395 GRanges S4
chr13 373 GRanges S4
chr14 358 GRanges S4
chr15 388 GRanges S4
chr16 340 GRanges S4
chr17 465 GRanges S4
chr18 287 GRanges S4
chr19 357 GRanges S4
```

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