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If you can write a command that can calculate the function you need, then you're done: gnuplot> f(x) = real(system(sprintf("echo %f", x))) gnuplot> plot f(x) (see help system) So you can use e.g. octave to calculate your value. E.g., if your system is linux, you can have directly: gnuplot> bJ(a,x) = real(system(sprintf("echo 'besselj(%f,%f)' | ...

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