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 Triangular wave fitting		  New Topic  Reply to Topic
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husseinmangi

France
3 Posts
Posted - 01/24/2014 :  03:40:42 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hello

I want to fit a triangular wave form on my data. I found sine but i need trianglar one. Plz help me in this regard

Thank you in advance

Hussein

lkb0221

China
497 Posts
Posted - 01/24/2014 :  11:16:50 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

You can try "PWL2" function under "piecewise" category to fit a single arbitrary triangular wave.

Or use "SawtoothWave" function under "Waveform" to fit sawtooth wave.

Zheng
OriginLab
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Ingafreeman

Latvia
1 Posts
Posted - 01/25/2014 :  04:28:22 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
It helps me too
Edited by - Ingafreeman on 01/25/2014 04:42:00 AM
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husseinmangi

France
3 Posts
Posted - 01/25/2014 :  08:38:15 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hello

I could not find sawtooth wave form in origin. Do you have a formula for it plz?

hussein
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Echo_Chu

China
Posts
Posted - 01/26/2014 :  01:03:01 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
SawtoothWave is available from Origin 9.1. You can look at the formula for it in the page blow

http://www.originlab.com/doc/Origin-Help/SawtoothWave-FitFunc
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husseinmangi

France
3 Posts
Posted - 01/26/2014 :  07:32:49 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Sorry I am beginner

I don't know where to find it or call it to fit on my data.
I have origin 9.1. But I don't see any Sawtooth wave form in waveform menu.
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Echo_Chu

China
Posts
Posted - 01/26/2014 :  9:46:43 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
well, Hussein. Could you see whether you can see the SawtoothWave with steps below?

1. Select Analysis: Fitting: Nonlinear Curve Fit from the Origin menu
2. In the opened dialog, select Category as Waveform and select Function as SawtoothWave as image blow
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