Depending on how your codes are structured, try to decide early on whether to use gpuArray or regular array. Most Matlab built-in functions will automatically determine and use gpuArrays.
function Output = main(Input)
%Decide early to use gpuArray
if gpuDeviceCount > 0
Input = gpuArray(Input);
end
%Use functions that support either gpuArray or regular arrays as inputs
plot(Input)
Input = myCustonFcn(Input) %custom function that allows gpuArray inputs
%Return as a regular array when done
if existsOnGPU(Input)
Output = gather(Input);
else
Output = Input;
end
