Hi everybody, how can I create a loop for plotting parameters for each level of a variable, for example: NAME temperature depth aaa 23 -1 aaa 22 -2 aaa 24 -1 bbb 23 -4 bbb 23 -1 aaa 22 -1 bbb 22 0 I mean, I would like R to plot temperature vs depth for aaa, then another plot for bbb, and so on. Is it for loop ok? Thanks