Method getMedian

src/data/DataStore.ts:513–532

* Get median of data in one dimension

(dim: DimensionIndex)

     * Get median of data in one dimension
     */
    getMedian(dim: DimensionIndex): number {
        const dimDataArray: number[] = [];
        // map all data of one dimension
        this.each([dim], function (val) {
            if (!isNaN(val as number)) {
                dimDataArray.push(val);
            }
        });

        // TODO
        // Use quick select?
        asc(dimDataArray);
        const len = this.count();
        // calculate median
        return len === 0
            ? 0
            : len % 2 === 1
            ? dimDataArray[(len - 1) / 2]
            : (dimDataArray[len / 2] + dimDataArray[len / 2 - 1]) / 2;
    }

    /**
     * Retrieve the index with given raw data index.