- Synopsis
- Defaults
- Keyword arguments
- Description
- Relaxation curve fitting parameters
- Model-free parameters
- Reduced spectral density mapping parameters
- Consistency testing parameters
- N-state model parameters
- Relaxation dispersion parameters
- Frame order parameters
- Prompt examples

value.copy

Copy parameters from one data pipe to another.

value.copy(pipe_from=None, pipe_to=None, param=None, force=False)

pipe_from: The name of the pipe to copy from.

pipe_to: The name of the pipe to copy to.

param: The parameter to copy. Only one parameter may be selected.

force: A flag which, if set to True, will cause the destination parameter to be overwritten.

If this is used to change values of previously minimised parameters, then the minimisation statistics (chi-squared value, iteration count, function count, gradient count, and Hessian count) will be reset.

Please see Table 17.27 on page .

Please see Table 17.28 on page .

Setting a parameter value may have no effect depending on which model-free model is chosen. For example if *S*^{2}_{f} values and *S*^{2}_{s} values are set but the data pipe corresponds to the model-free model ``m4`' then because these data values are not parameters of the model they will have no effect.

Note that the *R*_{ex} values are scaled quadratically with field strength and should be supplied as a field strength independent value. Use the following formula to obtain the correct value:

value = rex / (2.0 * pi * frequency) ** 2

where:

- rex is the chemical exchange value for the current frequency.
- frequency is the proton frequency corresponding to the data.

Please see Table 17.29 on page .

In reduced spectral density mapping, the CSA value must be set prior to the calculation of spectral density values.

Please see Table 17.30 on page .

In consistency testing, the CSA value, angle Theta (``orientation`') and global correlation time must be set prior to the calculation of consistency functions.

Please see Table 17.31 on page .

Setting parameters for the N-state model is a little different from the other type of analyses as each state has a set of parameters with the same names as the other states. To set the parameters for a specific state c (ranging from 0 for the first to N-1 for the last, the number c should be given as the index argument. So the Euler angle *γ* of the third state is specified using the parameter name ``gamma`' and index of 2.

Please see Table 17.32 on page .

Any of the relaxation dispersion parameters which are of the ``float`' type can be set. Note that setting values for parameters which are not part of the model will have no effect.

Please see Table 17.6 on page .

To copy the CSA values from the data pipe ``m1`' to ``m2`', type:

[numbers=none] relax> value.copy('m1', 'm2', 'csa')