NAG Library Manual, Mark 30.2
Interfaces:  FL   CL   CPP   AD 

NAG FL Interface Introduction
Example description
 E01ABF Example Program Results

 Central differences order 0 of Y0 =    -1.00000
                                Y1 =    -0.46000
 Central differences order 1 of Y0 =     1.01000
                                Y1 =     1.92000
 Central differences order 2 of Y0 =    -0.04000
                                Y1 =     3.80000

 Function value at interpolation point =    -0.83591