I am creating a scatter plot and I would like to add a line to the plot based on a y value. The y axis is not fixed and the line is specific to a value. How do I add a line to the plot?
example plot: scatter([0 10 20 30 40],[3 5 3 2 9]);
something like: line([0 40],[15 15], 'Color','r')
where line would go across the whole plot at 15 on the y and be red in color
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