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What do you want exactly to do ?
Be aware that, in matlab there is no way to represent a continous time signal 
.
.What you can, do is to have a discrete time signal 
and produce a second discrete time signal 
, where 
, ( i.e. a higher sampling rate has been used to produce 
).
and produce a second discrete time signal , where , ( i.e. a higher sampling rate has been used to produce ). 
