

stream=hyCase.Flowsheet.MaterialStreams

stream.Item('D').temperatureValue     
stream.Item('D').MassFlowValue
stream.Item('D').pressureValue

strom=struct('D',struct('t',stream.Item('D').TemperatureValue,...
                        'm',stream.Item('D').MassFlowValue,...
                        'p',stream.Item('D').pressureValue))
s=struct('t',[],'m',[],'p',[])
                    
data_alt=struct('D',s)