Create an operating point specification for the model.
opspec = operspec(mdl);
The States property of the operating point specification object contains one state
specification for each Simscape state in the model.
To obtain the index of a specification that corresponds to a Simscape state, specify the
state name. For example, get the index of the pressure state of Tank3.
idx = getStateIndex(opspec,'scdTanks_simscape.Tank3.pressure')
idx =
21 1
getStateIndex