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Probability generating function
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Calculating the probability-generating function from the pmf vector
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.. method:: ctx.pgf_from_pmf_vector(x, cf)

    where ``ctx`` is ``dec``, ``mpm``, or ``gmp``.

    Some text





Calculating the probability-generating function from the moment-generating function
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.. method:: ctx.pgf_from_mgf(x, cf)

    where ``ctx`` is ``dec``, ``mpm``, or ``gmp``.


    Some text