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# Index Filters

You may wish to create charts using entities that have too many dimensions to render in a 2D chart.

In this case, you can use an index filter to reduce the dimensionality of the index set for your entity, so that the remaining elements can be included in charts. It can also be used in conjunction with the repeat function to filter the content presented in each repetition. For more, see To Repeat a Table Column for each Element in a Set (pivot table).

Use the `vdl-index-filter` element as a child of `vdl-chart-series`.

In the Palette > Components group, click and drag an Index Filter element onto the Table Column.

Figure : 1. Index filters
Its `set` attribute takes the name of the index set you wish to use, and its `value` attribute takes the name of the dimension.

    <vdl-chart>
        <vdl-chart-series entity="FactorySupply" series-set="Factories">
            <vdl-index-filter set="Factories" value="New York"></vdl-index-filter>
        </vdl-chart-series>
        <vdl-chart-series entity="FactoryDemand" series-set="Factories">
            <vdl-index-filter value="Paris" set="Factories"></vdl-index-filter>
        </vdl-chart-series>
    </vdl-chart>

Parent Topic Charts in views

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