TRIPP_FIT_SINUS

                            provide sinus function as needed for
                            input by TRIPP_CURVEFIT

                            auxilary fitting routine

                            tripp_fit_sinus,x,a,f,pder

       X    =  Variable passed into CURVEFIT.  It is the job of tripp_fit_sinus
               to interpret this variable.
       A    =  Vector of NTERMS function parameters.

       F    =  Vector of NPOINT values of function, y[i] = funct(x), output.
       PDER =  Array, (NPOINT, NTERMS), of partial derivatives of funct.
               PDER[I,J] = Derivative of function at ith point with
               respect to jth parameter.  Optional output parameter.
               PDER should not be calculated if the parameter is not
               supplied in call. If the /NODERIVATIVE keyword is set in the
               call to CURVEFIT then the user routine will never need to
               calculate PDER.

       Version 1.0, 1999/07,Stefan Dreizler
       Version 1.1, 2001/02,Stefan Dreizler, corrected sign error
                    2006/11,Sonja Schuh, some optimization: define pder
                            outside of loop now, merged two loops into one,
                            deleted dfda helper arrays and ifs in loop

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