f_cash_root_cython

gammapy.stats.f_cash_root_cython(x, counts, background, model)

Function to find root of. Described in Appendix A, Stewart (2009).

Parameters

xfloat

Model amplitude.

countsndarray

Count image slice, where model is defined.

backgroundndarray

Background image slice, where model is defined.

modelndarray

Source template (multiplied with exposure).