good progress, diff in nonlinear_op

testing/test_full_field.py

@@ -0,0 +1,37 @@
+import warnings
+
+import matplotlib.pyplot as plt
+import numpy as np
+import scgenerator as sc
+from customfunc.app import PlotApp
+from scgenerator.physics.simulate import RK4IP
+from customfunc import pprint
+
+warnings.filterwarnings("error")
+
+
+def main():
+    params = sc.Parameters.load("testing/configs/Chang2011Fig2.toml")
+    x = params.l * 1e9
+    o = np.argsort(x)
+    x = x[o]
+
+    plt.plot(x, sc.abs2(params.spec_0[o]))
+    state = sc.operators.CurrentState(
+        params.length, 0, params.step_size, 1.0, params.ifft, params.spec_0
+    )
+    # expD = np.exp(state.h / 2 * params.linear_operator(state))
+    # plt.plot(x, expD.imag[o], x, expD.real[o])
+    plt.plot(x, sc.abs2(params.nonlinear_operator(state))[o])
+    plt.yscale("log")
+    plt.xlim(100, 2000)
+    plt.show()
+
+    # for *_, spec in RK4IP(params).irun():
+    #     plt.plot(w[2:-2], sc.abs2(spec[ind]))
+    #     plt.show()
+    #     plt.close()
+
+
+if __name__ == "__main__":
+    main()