3 Replies Latest reply on Nov 13, 2018 1:26 PM by TimCarmichael

how to insert exponential trendlines?

ccoutinho Nov 12, 2018 12:22 PM

Hi there

I'd like to create a trendline in a graph like we usually do in plans with exponential trendlines, parabolic and linear.

Is there any way to do this through PI or I should create an equation that does that?

Thanks!

Re: how to insert exponential trendlines?

Lal_Babu_Shaik Nov 12, 2018 12:26 PM (in response to ccoutinho)

Hi Carlos

AF Analysis equation or AF table with values with PI Vision XY plot should give output you are expecting.

Thanks,
Lal Babu
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- Re: how to insert exponential trendlines?
  
  ccoutinho Nov 12, 2018 3:48 PM (in response to Lal_Babu_Shaik)
  
  Hello Lal Babu Shaik,
  
  Thank you for your answer
  
  I'm sorry but I never used AF Analysis Equation and I really don't know where I find it. In Af analysis equation is there any trendline suggestion?
  
  Thanks,
  Carlos
  
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Re: how to insert exponential trendlines?

TimCarmichael Nov 13, 2018 1:26 PM (in response to ccoutinho)

Carlos, in your question, you mentioned exponential trendlines, parabolic and linear. To men, that sounds like what could be referred to as a fixed-reference curve, or fixed data set.
Since the PI system is a time based system, all data points must have a time reference. A fixed data set, by definition, generally DOESN'T have a time reference.. but you require it to have one.

A few years back, I wrote an article explaining how to accomplish this, a link follows.

Fixed Reference Curve in PI
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