public void setYAxis(java.util.Collection<MeasureField> yAxis) {
        if (yAxis == null) {
            this.yAxis = null;
            return;
        }

        this.yAxis = new java.util.ArrayList<MeasureField>(yAxis);
    }
<p>
The y-axis field well of a scatter plot.
</p>
<p>
The y-axis is aggregated by category.
</p>

@param yAxis
       The y-axis field well of a scatter plot.</p>
       <p>
       The y-axis is aggregated by category.
aws-java-sdk-quicksight/src/main/java/com/amazonaws/services/quicksight/model/ScatterPlotCategoricallyAggregatedFieldWells.java