SRW - implement estimation of the convergence #23
Description
Convergence of the long-running SRW calculations could be estimated based on two criteria after N iterations (e.g., N=1000):
- the RMS and/or the FWHM convergence;
- the following ratio:
![$\frac{\int{[I_{n}(x, y)-I_{n-1}(x, y)]^{2}dxdy}}{[\int{I_{n}(x, y)dxdy}]^{2}}$](https://cloud.githubusercontent.com/assets/13209176/20498446/3abb6f8e-affb-11e6-9c55-24d951e898e3.png)
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