predict_factor(h_abs, h_abs_old, error_norm, error_norm_old)
The algorithm is described in .
If :None:None:`h_abs_old` and :None:None:`error_norm_old` are both not None then a two-step algorithm is used, otherwise a one-step algorithm is used.
Current and previous values of the step size, :None:None:`h_abs_old` can be None (see Notes).
Current and previous values of the error norm, :None:None:`error_norm_old` can be None (see Notes).
Predicted factor.
Predict by which factor to increase/decrease the step size.
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