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In my work I have a lot of cases, where I should calculate non-listable functions for a quite large number of points. To be more concrete, consider first listable function g[x,y,z] and then I should first calculate

f[x, y] = NSolve[g[x, y, z] == 0 && a[x, y] < z < b[x, y], z]

where a[x, y] and b[x, y] are listable known functions.

I'm interested in a set of values f[x, y] for $x\in[-x_0,\,x_0]$ & $y\in[-y_0,\,y_0]$. To do it, I fix steps dx and dy and use ParallelTable. However, the evaluation consumes a lot of time. Is it possible to use available, built-in functions to improve performance?

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  • $\begingroup$ You need to provide the definition of f[x,y], a[x,y], b[x,y] because there's nothing much else you can do and you've already got a ParallelTable. $\endgroup$ – flinty Sep 6 at 18:05
  • $\begingroup$ @flinty ok, is it possible to make NSolve listable? $\endgroup$ – Artem Alexandrov Sep 7 at 5:57

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