# NoConvergence¶

exception astropy.wcs.NoConvergence(*args, **kwargs)[source] [edit on github]

An error class used to report non-convergence and/or divergence of numerical methods. It is used to report errors in the iterative solution used by the all_world2pix().

Attributes

 best_solution (numpy.ndarray) Best solution achieved by the numerical method. accuracy (numpy.ndarray) Accuracy of the best_solution. niter (int) Number of iterations performed by the numerical method to compute best_solution. divergent (None, numpy.ndarray) Indices of the points in best_solution array for which the solution appears to be divergent. If the solution does not diverge, divergent will be set to None. slow_conv (None, numpy.ndarray) Indices of the solutions in best_solution array for which the solution failed to converge within the specified maximum number of iterations. If there are no non-converging solutions (i.e., if the required accuracy has been achieved for all input data points) then slow_conv will be set to None.