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Data fitting and slop

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amberly hadden
amberly hadden 2014-6-12
编辑： Image Analyst 2014-6-13
Hi Im interested to plot XY which is a curve also Im interested to fit a best fit curve through data which should follow the data trend as is and then the point from where curve is changing or having maximum curvature, (X-value at that point) and a best fit line from the trend where values are straight to get intercept, After getting intercept I would like to use intercept and slop to draw another model on same graph. please see the attached figure for detailed idea.
Guide me please Thank you

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Image Analyst
Image Analyst 2014-6-13
Your picture is not attached. All I can guess at is that this might help: http://www.mathworks.com/matlabcentral/fileexchange/32696-2d-line-curvature-and-normals
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amberly hadden
amberly hadden 2014-6-13
编辑：Image Analyst 2014-6-13
Hi its in the attachment and data set is also pasted here
Mag range Count per M range Cumulative Total Above Lower M in Range
2.10-2.199 2 43
2.2-2.299 10 41
2.3-2.399 2 31
2.4-2.499 16 29
2.5-2.599 4 13
2.6-2.699 6 9
2.7-2.799 1 3
2.8-2.899 1 2
2.9-2.999 1 1

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