How to know where a quiver(vector) ends? (Co-ordinates of Its arrow's tip)

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Nabhdeep Bansal 2015-10-27

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https://ww2.mathworks.cn/matlabcentral/answers/251215-how-to-know-where-a-quiver-vector-ends-co-ordinates-of-its-arrow-s-tip

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I wish to draw a funicular polygon. I need to start another quiver from where the previous one ends. What is the way to find out where the quiver ends. Attached a general example of construction of funicular polygon (similar to equilibrium diagram of various forces).