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Message: [QUOTE="toton, post: 2584485"] Hi, for my project I needs a few plots to visualize the data (mostly x-y plot) . Most of the existing plotting library either copy the data and do plotting, or takes a data pointer to an 2d x-y array, and plots it (without copying). As my data set is not so trivial (sometimes it is vector, sometimes list etc), and x, y are not fixed. so I want to have a plot as generic one, which take begin & end iterator, iterate over it and show the result. Thus, say I have data in the form vector<Point> , and where class Point{ int x; int y; int z; int i; }; and have ctor, and getters. Now, I want to specify, two iterators for the vector (or any other thing which can give two iterators, one of the forward iterator, or reverse iterator is a minimum condition), and also what to plot. I dont want to hardcode it saying Point "need to have" some x() and y() . Rather than I want to say, use x() and y() or y() and i() as data. Some sort of casting wil be fine. Anyone can give an idea? or point to a link for it (or already existing open-source library) ? I NO-NOT need the graphics code, or how to implement the plot . I am looking for how to interface data to plot. Any help appreciated. Thanks abir [/QUOTE]