CHEBY

Utility/GeneralEvaluates a CHEBYSHEV polynomial function.

Use

This function can be called by any user-defined subroutine.

Format

Fortran Calling Syntax: CALL CHEBY(X, X0, PAR, NPAR, IORD, VALUE, ERRFLG)
C/C++ Calling Syntax: c_cheby(x, x0, par, npar, iord, value, errflg)
Python Calling Syntax: [value, errflg] = py_cheby(x, x0, par, npar, iord)
MATLAB Calling Syntax: [value, errflg] = m_cheby(x, x0, par, npar, iord)

Attributes

X: [double precision]; The independent variable. For example, to specify time as the independent variable, specify X as TIME.
X0: [double precision]; The phase shift in the Chebychev polynomial.
PAR: [double precision]; The array of coefficients.
NPAR: [integer]; The number of coefficients specified.
IORD: [integer]; The order of the derivative that CHEBY has to return. Order can be 0, 1 or 2.

Output

Value: [integer]; The value that the subroutine returns.
Errflg: [logical]; A logical (true or false) variable that CHEBY returns to the calling subroutine. If CHEBY detects an error while calling the subroutine, it sets the error flag to true.