Can somebody tell me how to add formula in LVS command file to check the resistor value, for example, I spec the resistor value in the CDL nelist, and I give the squar resistance in the LVS command file: PARAMETER RES[RA] 1k, but I need this formula R=1k*[L-0.5]/[W+0.5] to calculate the practice resistor value, and I don't know how to add this formula.