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Algorithm cumulative peak from intermediates

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[quote][i]Originally posted by msjc1cg[/i]
[br]Hi,
I was facing a bit of difficulty while using the peak analysis tools.

So I have a plot with  multiple peaks. I have used the peak analyser to find ten different curves which when superimposed yield my initial complex curve.
All good till there, but I tried to replicate each of the equations on an excel sheet using the function that was used by the analyser and the A,y0,xc and we obtained from the table obtained from origin. I then try to find the y value for each x for each of the 10 curves/function. Shouldn't the summation of all these y values from y0 to y10 give me then y value for my initial complex function. Secondly I see that I only achieve the right answer by adding the values of y which are different to the baseline and then subtracting a multiple of the baseline from that sum.
Could you please give me an overview of the algorithm that the software uses to find the cumulative y from the intermediate y values.
Thank you.
[/quote]

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T O P I C R E V I E W
msjc1cg	Posted - 11/17/2016 : 06:16:33 AM Hi, I was facing a bit of difficulty while using the peak analysis tools. So I have a plot with multiple peaks. I have used the peak analyser to find ten different curves which when superimposed yield my initial complex curve. All good till there, but I tried to replicate each of the equations on an excel sheet using the function that was used by the analyser and the A,y0,xc and we obtained from the table obtained from origin. I then try to find the y value for each x for each of the 10 curves/function. Shouldn't the summation of all these y values from y0 to y10 give me then y value for my initial complex function. Secondly I see that I only achieve the right answer by adding the values of y which are different to the baseline and then subtracting a multiple of the baseline from that sum. Could you please give me an overview of the algorithm that the software uses to find the cumulative y from the intermediate y values. Thank you.
3 L A T E S T R E P L I E S (Newest First)
msjc1cg	Posted - 11/18/2016 : 12:31:12 PM Hi! I really appreciate your feedback!It was really of great help! Thanks easwar! Yes, the issue you pointed out was the error in my understanding. Thanks to you to yuki_wu for your time! Regards,
easwar	Posted - 11/18/2016 : 12:19:29 PM quote: Originally posted by msjc1cg Secondly I see that I only achieve the right answer by adding the values of y which are different to the baseline and then subtracting a multiple of the baseline from that sum. Looks to me that you are not subtracting the baseline before fitting, and then you are then looking at the y values reported for each individual peak in the FitPeakCurve sheet created by the Peak Analyzer. In that sheet, the baseline is added to EACH individual peak, so that when they are all plotted on the raw data, the y scales match. This is done so you can visualize the contribution from each individual peak to the overall fit curve and the data. So if you simply add all those individual Y values from that sheet, you are indeed adding the baseline values many times over. Easwar OriginLab
yuki_wu	Posted - 11/18/2016 : 01:18:37 AM Hi, I am not sure I understand your question fully. Lest I give a wrong answer, would you mind sending us your data with detailed description of the result you desire? It may help us to understand your question and check the problem. You can find the contact information here http://www.originlab.com/index.aspx?go=COMPANY/ContactUS Regards, Yuki OriginLab

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