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Dear all, I wrote a function test1 in test1.R. Right, I am writing another function test2 on test2.R and trying to use test1 function. How can I do? Is there any similar way like including test1.R in test2.R file? Thank You Very Much. Jia-Ming ============================ $BD%2HLC(B Jia-Ming Chang PhD Student Comparative Bioinformatics Group Bioinformatics and Genomics Programme Centre