Function prepareBoxplotData

src/chart/boxplot/prepareBoxplotData.ts:47–99

(
    rawData: number[][],
    opt: PrepareBoxplotDataOpt
)

 *      If 'none'/0 passed, min bound will not be used.
 */
export default function prepareBoxplotData(
    rawData: number[][],
    opt: PrepareBoxplotDataOpt
): {
    boxData: (number | string)[][];
    outliers: (number | string)[][];
} {
    opt = opt || {};
    const boxData = [];
    const outliers = [];
    const boundIQR = opt.boundIQR;
    const useExtreme = boundIQR === 'none' || boundIQR === 0;

    for (let i = 0; i < rawData.length; i++) {
        const ascList = asc(rawData[i].slice());

        const Q1 = quantile(ascList, 0.25);
        const Q2 = quantile(ascList, 0.5);
        const Q3 = quantile(ascList, 0.75);
        const min = ascList[0];
        const max = ascList[ascList.length - 1];

        const bound = (boundIQR == null ? 1.5 : boundIQR as number) * (Q3 - Q1);

        const low = useExtreme
            ? min
            : Math.max(min, Q1 - bound);
        const high = useExtreme
            ? max
            : Math.min(max, Q3 + bound);

        const itemNameFormatter = opt.itemNameFormatter;
        const itemName = isFunction(itemNameFormatter)
            ? itemNameFormatter({ value: i })
            : isString(itemNameFormatter)
            ? itemNameFormatter.replace('{value}', i + '')
            : i + '';

        boxData.push([itemName, low, Q1, Q2, Q3, high]);

        for (let j = 0; j < ascList.length; j++) {
            const dataItem = ascList[j];
            if (dataItem < low || dataItem > high) {
                const outlier = [itemName, dataItem];
                outliers.push(outlier);
            }
        }
    }
    return {
        boxData: boxData,
        outliers: outliers
    };
}