With this subroutine the user can define an amplitude. It is triggered bythe parameter USER on the *AMPLITUDE card. The header and variable description is as follows:
subroutine uamplitude(time,name,amplitude) ! ! user subroutine uamplitude: user defined amplitude definition ! ! INPUT: ! ! name amplitude name ! time time at which the amplitude is to be ! evaluated ! ! OUTPUT: ! ! amplitude value of the amplitude at time !