Understanding the number of intersection in bedtools jaccard

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Hello, I am using bedtools jaccard to compare two vcf files, as:

bedtools jaccard -a ancestors.calls.norm.snp.vcf.gz -b GC078310.calls.norm.snp.vcf.gz
intersection    union-intersection      jaccard n_intersections
1606899 1806667 0.889427        1536700

What I do not get is why n_intersections is equal to 1536700. Especially, the difference between intersection and n_intersections is not very clear to my mind.

Any help would be greatly appreciated.

Thanks a lot!


bedtools


comparison


vcf


snps

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