Figure 2From: New spectral collocation algorithms for one- and two-dimensional Schrödinger equations with a Kerr law nonlinearity Space-graph of the imaginary part of the absolute error related to the problem ( 63 ), where \(\pmb{N=M=20}\) , \(\pmb{\alpha _{1}=\beta _{1}=\alpha _{2}=\beta _{2}=0}\) . Back to article page