c# slope computation

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hi all,
how can I extract major slopes of a line graph?(automatically, in c# or c++)
like the image below, there are three main slopes which is drawn in red on main graph

thanks in advance

<img src="https://dl.dropboxusercontent.com/u/968461/untitled.png" alt="Smiley" height="300" width="360">

Posted 21-Jul-14 22:23pm

hesam_ipp

Updated 21-Jul-14 22:33pm

v3

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lukeer 22-Jul-14 4:58am

First, you need to separate the main sections from one another, then you can compute their slopes.
Are those sections at the same position on the x-axis all the time?
Is there always the same count of sections?

Please update your question accordingly.

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CPallini · Answer 1 · 2014-07-21T22:29:00

Solution 1

What do you mean with 'major' slopes?
You know, the slope of a curve at is dy/dx, computed at the given point. If you have not the exact y(x) formula then you might use the approximation

C++

slope = (y2-y1)/(x2-x1)

where x1, x2 are 'close enough'.

Posted 21-Jul-14 22:29pm

CPallini

Updated 21-Jul-14 22:30pm

v2

Comments

hesam_ipp 22-Jul-14 4:38am

as i mentioned, i wana extract the slope of main areas of a graph
how can i write a program to automatically detect the major areas(e.g. three part in the image above)

CPallini 22-Jul-14 4:49am

You have to define 'main area'. What you mean with it?