Based on a generalized derivative nonlinear Schrödinger(gDNLS)equation,this paper proves the error of the Jump matrix under time evolution about the Riemann-Hilbert problem on a straight line of the initial value problem.When the time tends to infinity,the error order of the Jump matrix and the long-term asymptotic solution changes from O(t-1/2)to O(t-1/2ln t).
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