Data fitting and slop

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

Answer 1

[Image Analyst]

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

[amberly hadden]

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