Tabulated function definition

@X_ENTRY {xi}
@X_ENTRY {xj}
@COMMENTS {CommentText}


A tabulated function is a single entry table that lists the values of a function at discrete points. It describes a function of a single variable, F = F(x), where x is the independent variable and F the value of the function. For some applications, a continuous description of function F = F(x) is required. In that case, the discrete function must be approximated by its expansion in terms of Chebyshev polynomials. Tabulated function are used in conjunction with 1D functions. A plot of the function will be generated if plotting control parameters are defined.


  1. The nature of the data entered in the tabulated function is determined by parameter Fun1DType.
    • Possible values of parameter Fun1DType are listed for the associated 1D function.
    • Parameters Fun1DType defined for the tabulated function and associated 1D function must match.
    • Parameter Fun1DType defines the units of the xi and Fi entries of the tabulated function.
  2. Keyword @TABLE_ENTRIES introduces the list of tabulated function values. Any number of entries can be defined. Each table entry is defined by two keywords.
    • Keyword @X_ENTRY defines a discrete value of the independent variable, xi.
    • Keyword @Y_ENTRY defines the corresponding discrete value of the function Fi = F (xi) of the table.
  3. If keyword @NUMBER_OF_CHEBYSHEV_COEFFICIENTS appears, the tabulated data will be approximated by means of a Chebyshev expansion using N Chebyshev polynomials.
  4. It is possible to attach comments to the definition of the object; these comments have no effect on its definition.