Method var

src/danfojs-base/core/frame.ts:1055–1074

* Return variance of values in a DataFrame across specified axis. * @param options.axis 0 or 1. If 0, compute the variance column-wise, if 1, add row-wise. Defaults to 1 * @example * ``` * const df = new DataFrame([[1, 2], [3, 4]], { columns: ['A', 'B']}) * df.var().print()

(options?: { axis?: 0 | 1 })

     * ```
    */
    var(options?: { axis?: 0 | 1 }): Series {
        const { axis } = { axis: 1, ...options }

        if (this.$frameIsNotCompactibleForArithmeticOperation()) {
            throw Error("TypeError: var operation is not supported for string dtypes");
        }

        if ([0, 1].indexOf(axis) === -1) {
            throw Error("ParamError: Axis must be 0 or 1");
        }

        const newData = this.$getDataByAxisWithMissingValuesRemoved(axis)
        const resultArr = newData.map(arr => variance(arr))
        if (axis === 0) {
            return new Series(resultArr, { index: this.columns });
        } else {
            return new Series(resultArr, { index: this.index });
        }

    }

    /**
     * Get Less than of dataframe and other, element-wise (binary operator lt).