levenberg_marquardt(chi2_func=None,
dchi2_func=None,
dfunc=None,
errors=None,
args=(),
x0=None,
func_tol=1e-25,
grad_tol=None,
maxiter=1000000.0,
full_output=0,
print_flag=0,
print_prefix='')
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Levenberg-Marquardt minimimisation.
Function options
~~~~~~~~~~~~~~~~
chi2_func: User supplied chi-squared function which is run with the function parameters and
args as options.
dchi2_func: User supplied chi-squared gradient function which is run with the function
parameters and args as options.
dfunc: User supplied function which should return a vector of partial derivatives of the
function which back calculates values for the chi-squared function.
params: The initial function parameter values.
errors: The experimental errors.
args: A tuple containing the arguments to send to chi2_func and dchi2_func.
maxiter: The maximum number of iterations.
full_output: A flag specifying what should be returned.
Output
~~~~~~
If full_output = 0, the parameter values and chi-squared value are returned as a tuple.
If full_output = 1, the parameter values, chi-squared value, number of iterations, and the
warning flag are returned as a tuple.
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