Question: bedtools complement error
0
gravatar for bk11
10 weeks ago by
bk1130
bk1130 wrote:

Hi I have an error from bedtools. What might be happening? I have two bed files:

cat A.bed
chr1  100  200
chr1  400  500
chr1  500  800

cat my.genome
chr1  1000
chr2  800

when I run this:

bedtools complement -i A.bed -g your.genome

It gives

Error: The genome file your.genome has no valid entries. Exiting.
bedtools • 197 views
ADD COMMENTlink modified 10 weeks ago by Alex Reynolds27k • written 10 weeks ago by bk1130
0
gravatar for ATpoint
10 weeks ago by
ATpoint13k
Germany
ATpoint13k wrote:

your.genome must be tab-delimited.

ADD COMMENTlink written 10 weeks ago by ATpoint13k

I changed it into tab-delimited and still does not work.

sed 's/ /\t/g' my.genome >my.genome1
cat my.genome1

chr1        1000
chr2        800
ADD REPLYlink written 10 weeks ago by bk1130

If your files were tab-delimited, it would work. You probably substituted the wrong delimiter in your sedcommand. Probably it is a double-whitespace or something, and after your command you now have a hybrid tab-whitespace delimiter.

enter image description here

ADD REPLYlink modified 10 weeks ago • written 10 weeks ago by ATpoint13k

Could you please show your command lines who you generated bed files? I am still having problem.

ADD REPLYlink written 10 weeks ago by bk1130

In this case I simply did it manually by tiping it in a text editor. What organism are you working on? There are genome.sizes files available for download for most species.

ADD REPLYlink modified 10 weeks ago • written 10 weeks ago by ATpoint13k

Try replacing all [[:space:]]+ with \t. That should work.

ADD REPLYlink written 10 weeks ago by RamRS20k
0
gravatar for Alex Reynolds
10 weeks ago by
Alex Reynolds27k
Seattle, WA USA
Alex Reynolds27k wrote:

Here's a one-liner that should work:

$ bedops --complement <( sort-bed A.bed ) <( awk -v OFS="\t" '{ print $1, "0", $2 }' my.genome | sort-bed - )  > answer.bed

This part is called a process substitution in the bash shell:

... <( awk -v OFS="\t" '{ print $1, "0", $2 }' my.genome | sort-bed - ) ...

It uses awk to turn the file my.genome into a sorted BED file, on which you can do set operations with bedops. Basically, everything within <( ... ) returns operational intervals that are fed to the bedops process as a standard input stream.

Here's what the one-liner looks like when broken down into separate commands:

$ sort-bed A.bed > A.sorted.bed
$ awk -v OFS="\t" '{ print $1, "0", $2 }' my.genome | sort-bed - > my.genome.sorted.bed
$ bedops --complement A.sorted.bed my.genome.sorted.bed > answer.bed
$ rm A.sorted.bed my.genome.sorted.bed

Process substitutions might look a little odd, at first, but they help avoid creating intermediate files, which slow down operations on whole-genome scale work. Intermediate files also require disk space and need cleaning up. It's useful to avoid intermediate files, when possible.

ADD COMMENTlink modified 10 weeks ago by ATpoint13k • written 10 weeks ago by Alex Reynolds27k

I added a whitespace between all awk -v and OFS=. Hope you don't mind :)

ADD REPLYlink written 10 weeks ago by ATpoint13k
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