D04AAF Example Program Results Four separate runs to calculate the first four odd order derivatives of FUN(X) = 0.5*exp(2.0*X-1.0) at X = 0.5. The exact results are 1, 4, 16 and 64 Input parameters common to all four runs XVAL = 0.5 NDER = -7 IFAIL = 0 with step length 0.5000 the results are Order Derivative Questionable? 1 0.1392E+04 Yes 3 -0.3139E+04 Yes 5 0.8762E+04 Yes 7 -0.2475E+05 Yes with step length 0.0500 the results are Order Derivative Questionable? 1 0.1000E+01 No 3 0.4000E+01 No 5 0.1600E+02 No 7 0.6400E+02 No with step length 0.0050 the results are Order Derivative Questionable? 1 0.1000E+01 No 3 0.4000E+01 No 5 0.1600E+02 No 7 0.6404E+02 No with step length 0.0005 the results are Order Derivative Questionable? 1 0.1000E+01 No 3 0.4000E+01 No 5 0.1599E+02 No 7 0.3825E+05 Yes