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maxima.eval('load("plotdf" maxima.eval('plotdf(-2xy+1,[trajectory_at,0,0],[x,-3,3],[y,-3,3])')

Thanks for all the helpful comments. I now vaguely remember having been unable to plot the error function in Sage

Plotting as a vector field works:

maxima.eval('load("plotdf")') maxima.eval('plotdf(-2xy+1,[trajectory_at,0,0],[x,-3,3],[y,-3,3])')

Thanks for all the helpful comments. I now vaguely remember having been unable to plot the error function in SageSage before.

Plotting as a vector field works:

maxima.eval('load("plotdf")') maxima.eval('load("plotdf")')

maxima.eval('plotdf(-2xy+1,[trajectory_at,0,0],[x,-3,3],[y,-3,3])')