In LTspice simulator- How to create RMS measurement by measuring the trapezoidal signal

Hi, I am a post graduate power electronics engineer and having very good experience in product design and development. I am excellent in SMPS, supplies design from few watts to KW range using Buck, Boost, Buck -boost, Push Pull and H-bridge inverters I am excellent in solar, wind, Micro grid, smart grid and IEEE bus systems development in MATLAB Simulink Design, PSPICE, PSIM ,MULTISIM and LTSpice , Proteus Simulations. I did many projects for MS and PhD thesis like grid connected solar, wind, wave energy grid connected systems using MPPT, Multi-level converters, Inverters with different control algorithms, hybrid systems development and D-STATCOMs, FACTS devices for power stability, quality and control electrical vehicles, inductor motors. I worked for vehicle design simulation for different applications. I use to design Solar with MPPT using buck, buck-boost topologies, Power quality and control using Active filters, Opamp based circuit, digital circuits etc. I understand your requirement and ready to work for you. Please contact me for further discussion.

I am electrical engineering .I have lot of experience working with various employers globally. Can I do Circuit Analysis and design, Power System Analysis,DC/AC machines Electrical Distribution , translation and technical writer .i use Autocad,Matlab,Revit,Plc simulator, Pspice,word and excel.

I have a ready solution for your assignment. And the input can be fed not only the trapezoid, but also any function