Dear Patrick, thank you very much for your reply to my query, I am sorry C column means Chr# only, i get from a value of "408068" for ASSAY "XY1723" to a value of "658068 (408068+250000)" not the "563360" and it may little less or more (no need tobe eaxctly same 658068) and i miss typed it and starting point is lowest MP value beasuce data was sorted MP and chr# coulmns. I want to select assays having 250000 MP differences for 1 in chr# column and then i want to repeat this upto 12 in chr# column because i have 12 numbers in chr# column basically i will treat all the assays having 1 in chr# column as one block and i select assays having 250000 MP differences in that block ans then go to 2nd block (assays having 2 in chr# column) and applying same procedure as we did before and want to repeat upto 12 in chr# column. Thanking you very much, Regards, Genetist
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