Dear people:

I have two bed files and I want to calculate the coverage using the bedtools one by one ,such as this :

A bed files:

chr1      25     30

chr1      10     50

B bed files :

chr1    20    30

chr1    0     100

I want to calculate the A bed files coverage with B bed files row by row using the bedtools coverage,but But it's the result is not my wanted

The ideal result like this :

chr1      10      30   0.5

chr1      10      50   0.4

Does anyone how to deal with it ,Thanks very much!!

Alex