How do I get values out of a scatter plot that are in between the data points

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Usama Ahmed 2020-2-15

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评论： Usama Ahmed 2020-2-15

采纳的回答： Image Analyst

Ok, so I have a dataset with a column of x values and a column of y values. I have plotted them as a scatter plot here.

What I want to do is extract x values for a given y value. E.g. what are the x values when y = 17? As you can see, a given y value might not actually have a "plotted" x value.

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Image Analyst 2020-2-15

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编辑：Image Analyst 2020-2-15

spline_demo.m

You could try spline() or interp1(). See attached demo.

Red points are the original "knots" and the blue points are the interpolated points.

You can maybe reverse the x and y and plug the y into spline to get the x.

Or else make a few million interpolated points and use ismembertol(), though there may be a more direct and accurate way such as finding the two points on either side of hte y value and using bilinear interpolation.