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 Plot Fitting Slope
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kkchandrika

India
Posts

Posted - 11/15/2005 :  12:26:17 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin):
Operating System: XP

I have plotted some graph for the Rain and Signal Strength data collected from the INSAT 3B.

For Frequncy Vs Power Spectral Density

After this step I need to obtain a slop of the graph. Any one can help me out ...........

minimax

348 Posts

Posted - 11/15/2005 :  01:56:58 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Sarat Kotamraju,

When we refer to slope, it is often described as slope of a straight line. Therefore, you can perform a linear fit on your data and then get the slope. However, if the graph is not linear(at least basically), the slope of the graph maybe becomes meaningless.

With regard to linear fit procedure, you can follow steps like:
1. Active the graph, select Analysis - Fit Linear menu.
2. Fit results will be shown on the graph and Results Log. The fitted data will be stored in the new created worksheet "LinearFit1".

For more detailed description on how Linear Fit works, you can search Origin's Help with keywords "linear fit".
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Mike Buess

USA
3037 Posts

Posted - 11/15/2005 :  07:25:32 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
If you want the tangent at selected points try this add-on from the File Exchange...

http://www.originlab.com/fileexchange/details.aspx?fid=106

Mike Buess
Origin WebRing Member
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