r2eff_ns_mmq_2site_sq_dq_zq(M0=None,
F_vector=array([ 1., 0.]),
m1=None,
m2=None,
R20A=None,
R20B=None,
pA=None,
pB=None,
dw=None,
dwH=None,
k_AB=None,
k_BA=None,
inv_tcpmg=None,
tcp=None,
back_calc=None,
num_points=None,
power=None)
 source code

The 2site numerical solution to the BlochMcConnell equation for SQ,
ZQ, and DQ data.
The notation used here comes from:

Dmitry M. Korzhnev, Philipp Neudecker, Anthony Mittermaier, Vladislav
Yu. Orekhov, and Lewis E. Kay (2005). Multiplesite exchange in
proteins studied with a suite of six NMR relaxation dispersion
experiments: An application to the folding of a Fyn SH3 domain
mutant. J. Am. Chem. Soc., 127, 1560215611. (doi:
http://dx.doi.org/10.1021/ja054550e).
This function calculates and stores the R2eff values.
 Parameters:
M0 (numpy float64, rank1, 7D array)  This is a vector that contains the initial magnetizations
corresponding to the A and B state transverse magnetizations.
F_vector (numpy rank1, 2D float64 array)  The observable magnitisation vector. This defaults to [1, 0] for
X observable magnitisation.
m1 (numpy rank2, 2D complex64 array)  A complex numpy matrix to be populated.
m2 (numpy rank2, 2D complex64 array)  A complex numpy matrix to be populated.
R20A (float)  The transverse, spinspin relaxation rate for state A.
R20B (float)  The transverse, spinspin relaxation rate for state B.
pA (float)  The population of state A.
pB (float)  The population of state B.
dw (float)  The combined chemical exchange difference between states A and B
in rad/s. It should be set to dwH for 1H SQ data, dw for
heteronuclear SQ data, dwHdw for ZQ data, and dwH+dw for DQ
data.
dwH (float)  Unused  this is simply to match the r2eff_ns_mmq_2site_mq()
function arguments.
k_AB (float)  The rate of exchange from site A to B (rad/s).
k_BA (float)  The rate of exchange from site B to A (rad/s).
inv_tcpmg (float)  The inverse of the total duration of the CPMG element (in inverse
seconds).
tcp (numpy rank1 float array)  The tau_CPMG times (1 / 4.nu1).
back_calc (numpy rank1 float array)  The array for holding the back calculated R2eff values. Each
element corresponds to one of the CPMG nu1 frequencies.
num_points (int)  The number of points on the dispersion curve, equal to the length
of the tcp and back_calc arguments.
power (numpy int16, rank1 array)  The matrix exponential power array.
