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[Opal] Correlation term

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  • From: Nicole Neveu <nneveu AT>
  • To: opal <opal AT>
  • Subject: [Opal] Correlation term
  • Date: Mon, 31 Oct 2016 14:50:55 -0500

Hi OPAL'ers, 

What is the equation for xpx (column 21) in the stat file?
When I calculate xrms and pxrms, (using the h5 file and math definitions), the numbers match exactly. 
I thought the calculation would be similar for the correlation term. Something like:  

correlation = ( (np.sum(x*px)/npt) - (np.sum(x)/npt)*(np.sum(px)/npt) )

However, when I do this calculation, it does not match the xpx value listed in the stat file. 
Do I need to divide by xrms? What part of the equation am I missing? 



  • [Opal] Correlation term, Nicole Neveu, 10/31/2016

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