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## Vega-lite Deneb Y axis setting min value

using Veg-Lite I am trying to set the min value on then Y axis to be dynamic based on a data field "MLL 8%", in my case I have a \$100K trading account and I am only interested in seeing 8% below the \$100k and 8% above the \$100k, I don't want to see 0, therefore setting the view between 92,000 and 108,000. i ahve tried using Vega and not much success, and from the research I have been doing this is not straight forward, or at least not for me.

Any help will be greatly appreciated.

Toby

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Community Support

Hi @tobyt

You can take a look at the following steps that may help you.

1. Pre-calculate Your Bounds within Power BI: Before you pass your data to the Vega-Lite visualization, use Power BI to create calculated fields that represent the lower and upper bounds of your desired y-axis range. For an account value of \$100,000, with an 8% range:

• Lower Bound = \$100,000 - (\$100,000 * 0.08) = \$92,000
• Upper Bound = \$100,000 + (\$100,000 * 0.08) = \$108,000

These calculations can be done using DAX in Power BI to create new fields in your data model.

2. Adjust Vega-Lite Specification: With your bounds calculated, you'll then need to adjust the Vega-Lite specification within the Power BI Vega-Lite visual to use these bounds for the y-axis. Vega-Lite allows you to specify the domain of your axes, but this would typically involve static values rather than dynamic ones derived from the data. Since the dynamic computation is a bit tricky directly in Vega-Lite, relying on the pre-calculated bounds from Power BI is more straightforward.

3. Example Vega-Lite Axis Configuration: Assuming you have calculated fields for your bounds, your Vega-Lite specification could manually set the domain of the y-axis to use these bounds.

Best Regards,

Jayleny

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Hi V-jialongy

thank you for your response, I have already two measures in Power BI for the lower and upper bounds, "MLL 8%" and "Profit Target Value", respectively. when I define the domain with these values the visual changes so that everything is concentrated at the top of the gauge/bar. In Power BI you can set the y scale to automatic so that the y scale starts at the lowest value of the dataset, and this is what I am trying to achieve here as well. The scale has to adjust so that the y scale starts at "MLL 8%", instead the y scale is starting at "0". From what I have read, and I am not the expert here, Vega-Lite is limited and that I should be using Vega. I have tried Vega with no success trying to follow examples, but I haven't come across one that matches my requirements. I prefer to use Vega-Lite, however if Vega is the answer then that is what I will have to use.

Any thoughts as to how this could be done using Vega instead?

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