Copy RDC data from one data pipe to another.
pipe_from: The name of the pipe to copy the RDC data from.
pipe_to: The name of the pipe to copy the RDC data to.
align_id: The alignment ID string.
back_calc: A flag which if True will cause any back-calculated RDCs present to also be copied with the real values and errors.
This function will copy RDC data from `pipe_from' to `pipe_to'. If align_id is not given then all RDC data will be copied, otherwise only a specific data set will be.
To copy all RDC data from pipe `m1' to pipe `m9', type one of:
[numbers=none] relax> rdc.copy('m1', 'm9')
[numbers=none] relax> rdc.copy(pipe_from='m1', pipe_to='m9')
[numbers=none] relax> rdc.copy('m1', 'm9', None)
[numbers=none] relax> rdc.copy(pipe_from='m1', pipe_to='m9', align_id=None)
To copy only the `Th' RDC data from `m3' to `m6', type one of:
[numbers=none] relax> rdc.copy('m3', 'm6', 'Th')
[numbers=none] relax> rdc.copy(pipe_from='m3', pipe_to='m6', align_id='Th')