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Homework Help: How to draw tangent from point of inflection on a chart with peaks

  1. Oct 14, 2014 #1
    Hi , I have an assignment which requires that I draw tangents from the point of inflection on a peak to the x-axis.I still cannot figure out how to do that using qtiplot or excel.
  2. jcsd
  3. Oct 14, 2014 #2


    Staff: Mentor

    Can't you just print out the plot of the curve, and then manually draw in the tangent line?
  4. Oct 14, 2014 #3
    I'm having a bit of a problem with the phrase "the point of inflection on a peak". Except for things like square waves, inflection points don't happen on peaks.

    Are you quoting the assignment precisely?
  5. Oct 14, 2014 #4


    User Avatar
    2017 Award

    Staff: Mentor

    In excel, you can add another data series to your plot and adjust the values accordingly to get any line you want.
  6. Oct 14, 2014 #5
    I can , I thought it should look very professional.Sometimes I cant help thinking that way , thanks for drawing my attention to 'common sense'

    Its a chromatogram
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