def fromMatrix(stateObjs,*transProbsPerState):
''' returns a new Chain instance from given arguments
stateObjs is a sequence of objects representing states (strings, usually);
transProbsPerState arguments contain the transiiton probability weights;
there is one such argument per state, it is a tuple (stateObj,transProbs)
where transProbs is the sequence of probability weights of transition from
stateObj to each declared state, in the order of their declarations
'''
nextStateLeas = (Alea.fromValFreqs(*zip(stateObjs,transProbs)) for (stateObj,transProbs) in transProbsPerState)
nextStateLeaPerState = tuple(zip(stateObjs,nextStateLeas))
return Chain(nextStateLeaPerState)
