Hello,
I have a PI tag thats giving a value every couple of minutes and I would like to plot those values and calcualte the area under the curve. How can I do that in PI Asset Framework?
So, first getting the equation of a line y=mx+b then using that for the integral over time
Thank you,
As I understand it, you would like to calculate area under the curve using AF analysis and output the area as a value when initial tag changes... this will be a combination of analysis steps.
Something to keep in mind, I'm assuming x is the timestamp of the tag value, you will need to convert it to something meaningful, like "seconds since midnight" to get an integer value.
Variables
y=current tag value
m = slope
x = current tag value's "meaningful" timestamp
y0 = previous tag value
x0 = previous tag value's "meaningful" timestamp
dy = delta y = y - y0
dx = delta x = x - x0
To use an integral over a line (y=mx+b) you'd follow these analysis steps:
1) Solve for m => m = dy/dx
2) Solve for b => b = y - mx
3) Area = integral from x0 to x of "mx + b"
or
