[Kst] Addition of sample on a specific range

[mathieu660r at gmail.com]

Hi,

I'm new here and I find KST a really great tool for fast and efficient  
plotting. I'm currently using some hardware to measure the real power of  
some lights. I can plot the power easily and I can get the power value on  
the y axis and the time on the x axis. My question is a little bit complex  
so I will try to explain the best as I can if you have questions please  
ask. So I want to add all the value of a time sample ( example : all the  
value during 60 minutes and do it for each 60 minutes) and multiply the  
total value by another value to get an approximation of the cost of  
electricity.

Thanks,
Mathieu R.
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