function newy = FPCpred(res, xx, yy, newx, new_tx, y, new_ty)
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Input:
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  res, xx, yy:  The returned values from FPCreg. See FPCreg() for more details.
  newx:   1*numNewSub cell array contains measurements for new x functions
  new_tx: 1*numNewSub cell array contains time points corresponding to the newx
  y:      the scalar response Y vector used for estimation 
          Only needed when Y is a scalar.
  new_ty: 1*numNewSub cell array contains time points.

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Output:
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  newy:   1*numNewSub cell array contains predicted measurements for the
          corresponding newx and new_ty