DPlot

Hi David,
I try to use the multiple axis option, is there a way to change the scale of the curve2 to make the 3 curves(curve1, line, and curve2) have the same point of intersection???


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Not in general, no. You can probably come close by using Options>Extents/Intervals/Size and shifting the scale on Y2 up. But the rules for the Y2 axis are the same as Y1: the extents will be some multiple of the tick mark interval and the interval will be some "nice" number. So the chances of getting those 2 intersections to line up exactly is very slim.