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

[selseg]

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.

 

[Mark44]

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?

 

[.Scott]

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?

 

[mfb]

In excel, you can add another data series to your plot and adjust the values accordingly to get any line you want.

 

[selseg]

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'

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