1. An analog multiplier, comprising: an input circuit, a memristive device, and an output circuit; wherein the memristive device is coupled between the input circuit and the output circuit; wherein the input circuit is arranged to: receive or generate a first variable and a second variable; generate at least one memristive device input signal that once provided to the memristive device will cause a change in a state variable of the memristive device, wherein the change in the state variable of the memristive device reflects a product first and second variables; provide the memristive device the at least one memristive device input signal; wherein the output circuit is arranged to evaluate the state variable of the memristive device and to generate information about the above product.