Hello,

I have a question regarding if we reduce the number of count for the interpolated values in a graph from the actual number of values within a given time stamp will it alter the meaningful data from the graph or will there be any loss of data.

Thanks in advance.

R.Sreenivas

One of the issues that you have with fetching interpolated data is Nyquist theorem (that is you must fetch samples at <1/2 the period of the highest frequency that you wish to recover (or view).

I.e. if you fetch interpolated values for Sinusoid, across a 10 years with 1 value per day (e.g.) what will appear on a chart is a flat line (as the value of Sinusoid is the same every day at the same time).

(try adding sinusoid to an AF attribute, select Time Series Data and view 'Sampled' for a few hundred days - set interval to 12h

According to that the value of Sinusoid is always 12... must be broken

PlotValues is specifically engineered to avoid this - even if you select few data points, by giving you the best 'zoomed out' interpretation of the values _for a chart_

100 points plot values - it's a bit 'grainy' but you can see that it is a periodic waveform!

Without PlotValues, if you wanted to 'down-sample' your wave, you'd have to first analyse it and decide what was the highest frequency that you wanted to preserve. (FFT?)

Don't underestimate it's value when showing trends on a screen, it's a massive improvement on just fetching all of the points.

Cheers,

Rob