Thanks @genomax. It clarifies my doubt. I am following this tutorial http://asia.ensembl.org/info/docs/api/core/core_tutorial.html#coordinates
to convert the coordinates from grch38 to grch37 for chromosome 7 from 10000 to 20000. But, having difficulty in understanding the concept of how to do this using transform() and transfer() mentioned in the tutorial. Any suggestions?
Thanks