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LagrangeCoeff

Returns the coefficients of lagrange polynomial.

The Nth order lagrange polynomial in 1D can be described as:

li=∑n=0Nanxnl_{i} = \sum_{n=0}^{N} a_{n} x^{n}

This function returns coefficients ana_{n}

Interface 1​

INTERFACE
  MODULE FUNCTION LagrangeCoeff(order, elemType, i, xij) RESULT(ans)
    INTEGER(I4B), INTENT(IN) :: order
    !! order of polynomial
    INTEGER(I4B), INTENT(IN) :: elemType
    !! element type
    INTEGER(I4B), INTENT(IN) :: i
    !! ith coefficients for lagrange polynomial
    REAL(DFP), INTENT(IN) :: xij(:, :)
    !! points in xij format
    REAL(DFP), ALLOCATABLE :: ans(:)
    !! coefficients
  END FUNCTION LagrangeCoeff
END INTERFACE