Method head

src/danfojs-base/core/frame.ts:523–536

* Returns the first n values in a DataFrame * @param rows The number of rows to return * @example * ``` * const df = new DataFrame([[1, 2], [3, 4]], { columns: ['A', 'B']}) * const df2 = df.head(1) * ```

(rows: number = 5)

      * ```
    */
    head(rows: number = 5): DataFrame {

        if (rows <= 0) {
            throw new Error("ParamError: Number of rows cannot be less than 1")
        }
        if (this.shape[0] <= rows) {
            return this.copy()
        }
        if (this.shape[0] - rows < 0) {
            throw new Error("ParamError: Number of rows cannot be greater than available rows in data")
        }

        return this.iloc({ rows: [`0:${rows}`] })
    }

    /**
      * Returns the last n values in a DataFrame