topic Re: Plotting several trends from sensor data that have different units (or scale) in Discussions

Plotting several trends from sensor data that have different units (or scale)

FN — Sun, 11 Jun 2023 11:13:38 GMT

The GraphBuilder can be used to visualize sensor data as Y's and a DateTime as X to make trends.

However, when Y's have different units or scales, the only way I found to plot several Y's at once was:

Using dialog and 'Graph matrix'
Stacking the Y's and using the overlay function

Is there an option in Y-axis that several units or scales?

I only found the option of sending a secondary Y-axis.

Edit: Here is an example.

https://www.osisoft.com/-/media/Images/blog/PI-System-portfolios-blog/hpi-blog-4/ad_hoc_trending.ashx

Re: Plotting several trends from sensor data that have different units (or scale)

txnelson — Thu, 29 Apr 2021 12:36:26 GMT

Graph Builder allows a large number of columns to be displayed on the Y axis. It only allows the display of 2 different axes, left and right of the graph. The various Y axis columns can be assigned to either the left or right Y axes

Re: Plotting several trends from sensor data that have different units (or scale)

Mark_Bailey — Thu, 29 Apr 2021 15:08:59 GMT

Is this example what you mean by "different scales?"

Re: Plotting several trends from sensor data that have different units (or scale)

Thierry_S — Thu, 29 Apr 2021 15:13:09 GMT

Hi,
Another approach would be to Standardize your Y values (New Formula Column > Distributional > Standardize) hence scaling all of your sensor data to the same scale.
Just a thought.
Best,
TS

Re: Plotting several trends from sensor data that have different units (or scale)

FN — Mon, 03 May 2021 20:20:20 GMT

Yes, the issue appears when you have more than two.

I have been using Graph Matrix under Dialog, but I was wondering if several axis could be combined into one.

Re: Plotting several trends from sensor data that have different units (or scale)

FN — Mon, 03 May 2021 20:33:00 GMT

What to do when you need to combine several of them?
Example:
https://www.osisoft.com/-/media/Images/blog/PI-System-portfolios-blog/hpi-blog-4/ad_hoc_trending.ashx