Deneb: Use Calculation For Window Frame

Hi JayWee According to the Vega-Lite documentation, frame expects an array with two elements:

• The start of the frame relative to the current data object.
• The end of the frame relative to the current data object.

the frame property does not support dynamic expressions or calculations parseInt(datum.MvgAVG) * -1 .

It requires static numeric values or null. 
For more details on transformations please check this documentation Vega-Lite Window Transform documentation.
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Thanks In Advance

Hi JayWee,

Thank you for reaching out in Microsoft Community Forum.

Thank you Akash_Varuna  for the helpful response.

Please follow below steps to replace the start frame using slicer;

1.Vega-Lite's frame property only accepts static numeric values (e.g., [-1, 1]) — it cannot use dynamic expressions like parseInt(datum.X) or respond to slicers.

2.Slicers in Power BI cannot dynamically control frame in a Vega-Lite spec — it’s not interactive in that way.

3.To achieve dynamic behavior, perform the calculation in DAX or Power Query and pass the result to Vega-Lite.

4.Alternatively, use native Power BI visuals for dynamic rolling windows or frame-based calculations.

Please continue using Microsoft Community Forum.

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Regards,
Pavan.