## Tabulated function definition

@TABULATED_FUNCTION_DEFINITION {
@TABULATED_FUNCTION_NAME {TblFunName} {
@FUNCTION_1D_TYPE {Fun1DType}
@TABLE_ENTRIES {
@X_ENTRY {xi}
@Y_ENTRY {Fi}
@X_ENTRY {xj}
@Y_ENTRY {Fj}
}
@NUMBER_OF_CHEBYSHEV_COEFFICIENTS {N}
}
}

### Introduction

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.

### NOTES

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.