Jacket is a GPU engine for MATLAB®. Jacket enables standard MATLAB code to run on the GPU, connecting the user-friendliness of MATLAB directly to the speed and visual computing capability of the GPU. Jacket is not another GPU API, nor is it simply a collection of GPU MEX functions. Rather, it is a complete and transparent system, automatically making memory transfer and execution optimization decisions. Jacket uses a compile on-the-fly system to allow GPU functions to run in MATLAB's interpretive style. Currently, Jacket is built on NVIDIA's CUDA technology.