HELP. How to solve curve equation using excel or matlab - (Jan/30/2007 )

as title. I got standard curve data. According to the data sheet, I shall get a curve like sin or cos. Y-axis is normal, X-axis is log axis.
I need to solve out the curve equation so that I can calc my results.
urgent. help. thank you

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As i know , you can calc the equ ation if it suit for a linear model or log model.
In MatLab, you can use command nlinfit or nlintool to fit a nonlinear curve

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I suppose you want to do a non-linear fit. If so, I might be able to help you to use R to do a non-linear fit. I will post a demo tonight. But if you can give more details, I might be able to tailor a demo more relative to your problem.

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Here is the example of fitting a DNase data and pictures.

http://cyberpostdoc.org/joomla/index.php?/...ent/view/43/26/

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v useful. thanks so much.

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