Hi all, given two Vector and a list of strings, I generate a plot of one vector as a function of the other [1]. At each x,y point, I am trying to place the corresponding string. For the purpose, I zip3 all three sequences, define an annotation function, and invoke it with mapM_ in the context of withAnnotations [2]: withPlot (1, 1) $ do ... let annotation (x, y, label) = text (x + 2, y) (setText label) in withAnnotations $ do mapM_ annotation $ zip3 (toList vx) (toList vy) labels The code above compiles and runs, the plot shows, but no text annotations appear at all. I understand that I am not using the Annote monad correctly: the mapM_ drops every returned value, so the state is not altered. What is the correct way to invoke withAnnotations over a list of (x, y, String) ? Needless to say, I am a beginner in Haskell. Apologies if the above is too trivial. Thanks very much in advance. Albert [1] https://github.com/acardona/haskell-lib/blob/master/CATMAID/Analysis/Graph/P... [2] http://hackage.haskell.org/package/plot-0.2.3/docs/Graphics-Rendering-Plot-F... PS: unfortunately I had sent this message to haskell-cafe; sorry! -- http://albert.rierol.net http://www.ini.uzh.ch/~acardona/