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From NDSolve, I got this:

{{a1 -> InterpolatingFunction[{{0., 40.}}, "<>"]}}

What would be a sensible approach to getting the complex conjugate of this function, particularly bearing in mind that we might have to deal with derivatives higher than the zeroth and that the (possibly nonuniform) sampling of the interpolation should be respected?

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    $\begingroup$ I edited your question to try to clarify some of the issues. If I misunderstood your purpose, please say so. $\endgroup$
    – Oleksandr R.
    Commented Apr 20, 2014 at 4:53

1 Answer 1

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Perhaps conjugating the data in the IF:

sol = NDSolveValue[{y'[x] == I y[x], y[0] == 1}, y, {x, 0, 1}]

solbar = ReplacePart[sol, {4, 3} -> Conjugate[sol[[4, 3]]]]

ReImPlot[{sol[t], solbar[t]}, {t, 0, 1}, 
 PlotStyle -> {AbsoluteThickness[4], AbsoluteThickness[2]}]
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