set( n11, n12, n21, n22 ) {

		const te = this.elements;

		te[ 0 ] = n11; te[ 2 ] = n12;
		te[ 1 ] = n21; te[ 3 ] = n22;

		return this;

	}
Sets the elements of the matrix.The arguments are supposed to be
in row-major order.

@param {number} n11 - 1-1 matrix element.
@param {number} n12 - 1-2 matrix element.
@param {number} n21 - 2-1 matrix element.
@param {number} n22 - 2-2 matrix element.
@return {Matrix2} A reference to this matrix.