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Asked: 2026-06-02T02:06:01+00:00

Is it possible to plot rational functions in R? For example: curve(((x+2)*(x-5))/((x-3)*(x+1)), from=-8,to=9) gives

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Is it possible to plot rational functions in R? For example:

enter image description here

curve(((x+2)*(x-5))/((x-3)*(x+1)), from=-8,to=9) gives plots that are incorrect
probably because the function cannot be deinfed at x=-1 and x=4

Thanks a lot

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1 Answer

  1. Editorial Team

    R seems to handle even the asymptotic explosions fairly gracefully:

    curve( (x-5)*(x-3)/( (x+1)*(x-4) ), 3 ,5)

    To handle the case of discontinuity, increase n and replace ‘y’ with NA above a threshold.

    vals <- curve( (x-5)*(x-3)/( (x+1)*(x-4) ), -3 ,5, n=1000)
is.na(vals$y) <- abs(vals$y) > 100
plot(vals, type="l")
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