ISRO Computer Science (CSE) 2009 - Question 46

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The shift operator E is defined as E[f(xi)] = f(xi + h) and E^-1[f(xi)] = f(xi - h). Then Delta (forward difference) in terms of E is

  • A. E - 1
  • B. E
  • C. 1 - E^-1
  • D. 1 - E

Answer: A. E - 1

Explanation: Delta f(x) = f(x+h) - f(x) = E f(x) - f(x) = (E-1) f(x).

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