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

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Discussion Overview

The discussion revolves around the challenge of drawing tangents from a point of inflection on a peak in a chart, specifically using software tools like Qtiplot or Excel. Participants explore the concept of inflection points in relation to peaks and seek clarification on the assignment requirements.

Discussion Character

  • Homework-related, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant expresses difficulty in drawing tangents from a point of inflection on a peak using Qtiplot or Excel.
  • Another participant suggests that manually drawing the tangent line on a printed plot could be a solution.
  • A participant questions the phrasing of "the point of inflection on a peak," noting that inflection points typically do not occur at peaks except in specific cases like square waves.
  • One participant mentions that in Excel, it is possible to add another data series to adjust values for creating the desired line.
  • A participant reflects on the desire for a professional appearance in the plot and reiterates confusion regarding the assignment's terminology, identifying the context as a chromatogram.

Areas of Agreement / Disagreement

Participants express differing views on the existence of inflection points at peaks, with some questioning the assignment's wording while others provide potential solutions. The discussion remains unresolved regarding the correct interpretation of the assignment and the best method to achieve the task.

Contextual Notes

There is uncertainty regarding the definition of inflection points in the context of peaks, and the discussion highlights potential limitations in the assignment's phrasing.

selseg
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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.
 
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selseg said:
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.
Can't you just print out the plot of the curve, and then manually draw in the tangent line?
 
selseg said:
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.
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?
 
In excel, you can add another data series to your plot and adjust the values accordingly to get any line you want.
 
I can , I thought it should look very professional.Sometimes I can't help thinking that way , thanks for drawing my attention to 'common sense'
.Scott said:
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?
Its a chromatogram
 

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