Figure 2

The normalized errors at different IJE iterations in noiseless case. ||r(l)||₂ denotes the norm of residual error after l th iteration. f is actual frequency of the sinusoid and $\widehat{g}(l)$ is the estimate of grid point. In the plots, ||r(l)||₂ and $|\mathit{ĝ}\left(l\right)-f|$ are normalize with ||r(0)||₂ and $|\mathit{ĝ}\left(0\right)-f|$, respectively.