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I have made a plot using ggplot on R and using the function nls because it was a non linear regression, now I would like to extract data from the graph, specifically I would like to know the value of the 2 curves in the graph when the y value is 0, and I have to do it using R..

Is it possible?

nico
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Khandar
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  • Can you check out http://stackoverflow.com/questions/10302851/extract-coefficients-from-ggplot2-created-nls-fit It might do the trick for you – Steph Locke Dec 05 '13 at 16:54
  • Thank you very much I had not seen it – Khandar Dec 05 '13 at 16:56
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    Technically this isn't extracting data from the **graph** -- it's getting the source data from the generating object. If you want to get a few data points from a graph, use `locator` or `identify` ; otherwise dump the graph into EngaugeDigitizer or DataThief – Carl Witthoft Dec 05 '13 at 17:53

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