A system can include a memristive crossbar array, which can include row lines and column lines intersecting the row lines. Resistive memory elements can be coupled between the row lines and the column lines at the junctions formed by the row and column lines. The resistive memory elements represent the values of the matrix. The system can further include an analogue circuit. The system can be configured to perform an exponentiation of the values of the vector in accordance with a first exponent. The crossbar array can be configured to apply the resulting values of the vector to the resistive elements thereby generating currents. The analogue circuit can be configured to perform an exponentiation of the generated currents in accordance with a second exponent.