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The value of the function f(x) is given at n distinct values of x and its value is to be interpolated at the point x* using all the n points. The estimate is obtained first by the Lagrange polynomial, denoted by IL, and then by the Newton polynomial, denoted by IN.
Q. Which one of the following statements is correct?
  • a)
    IL is always greater than IN
  • b)
    No definite relation exists between IL and IN.
  • c)
    IL is always less than IN
  • d)
    IL and IN are always equal
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The value of the function f(x) is given at n distinct values of x and ...
Lagrange’s form is more efficient when you have to interpolate several data sets on the same data point.
Newton’s form is more efficient when you have to interpolate data incrementally. So no relationship between both.
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Most Upvoted Answer
The value of the function f(x) is given at n distinct values of x and ...
Explanation:

  • Both Lagrange polynomial (IL) and Newton polynomial (IN) are used for interpolation of a function f(x) at a point x* using n known values of f(x).

  • However, the IL uses the Lagrange basis functions to construct the polynomial, whereas the IN uses divided difference table to construct the polynomial.

  • There is no definite relation between the IL and IN as they use different methods for interpolation.

  • The accuracy of the interpolation estimate depends on the number of known values of f(x) and the distribution of these values.

  • Therefore, the choice of interpolation method depends on the specific problem and the available data.


Hence, option 'B' is the correct answer.
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The value of the function f(x) is given at n distinct values of x and its value is to be interpolated at the point x* using all the n points. The estimate is obtained first by the Lagrange polynomial, denoted by IL, and then by the Newton polynomial, denoted by IN.Q.Which one of the following statements is correct?a)IL is always greater than INb)No definite relation exists between IL and IN.c)IL is always less than INd)IL and IN are always equalCorrect answer is option 'B'. Can you explain this answer?
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