There is a spectre toolbox for Matlab in the MMSIM stream. This allows you to directly read the simulation result database in Matlab.
Look in <MMSIMinstDir>/tools/spectre/examples/SpectreRF_workshop/SpectreRF_AN at MatlabAN.pdf and MatlabWorkshop.pdf (it's also covered in the documentation), and it will explain what exists and how to use it.
It's also possible in ViVA (in IC61X) to export from the results browser to Matlab.
In IC61X, you can also use Matlab measures in ADE XL (you can do the same kind of thing with VSDE if you're using IC5141).