I have acquired data from testing an electric motor on a test bench. The data is organized in 3 matrices, one matrix for rpm, one for motor torque and one for efficiency. The motor was controlled by arduino and the test consisted on forcing an acceleration ramp at different slopes. The matrices have a size of 5326X15 where each column correspond to a ramp. I am seeking a way to create a grid of rpm and torque and interpolate the efficiency values at those grid points.