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Using labview 8.5, developer suite. I have the X and Y inputs for an XY graph (in (sub)array form), I also have the XY graph outputting well. I need to take the gradient of this graph, so I am trying to use NI_Gmath.lvlib:Differentiation.vi however this needs the formula of the graph! I can't for the life of me think how to get this in the form it wants (string)