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Dear R-experts, I have a data file df as the following: genename variable at 1hr variable at 4 hr variable at 10 hr gene1 gene2 . . . gene5000 I would like to have a graph with X-axis as the time point (1hr, 4hr, 10hr), and Y-axis as the value of the variable. So, basically, I want to do a line with the three different values at 1hr , 4hr and 10hr for all the 5000 genes. My purpose is