hi,thank you all,the books and links suggested by perl monks have been useful.I could write code.I will uplaod the code if somebody needs it.I need one more help form monks. The problem is,I want to calculate the distance between x,y,z coordinate,from HOH to all other molecules.Then I have to make a table or something like that .The table headings are Serial number of HOH,Serial number of other atoms,Atom name,How many atoms are close to each HOH within 5 angstroms distance. Till now I have calculated the distance and found out all atoms within 5 Angstroms distance.But I unable to format the out put required.Please help me.

In reply to Re^2: Frequency of amino acids from 'ATOM ' of PDB by RRK
in thread Frequency of amino acids from 'ATOM ' of PDB by RRK

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