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This is the gamma_p from the boost library
gammap(a, z)
The numeric 'a' parameter in the normalized lower incomplete gamma
The numeric 'z' parameter in the normalized lower incomplete gamma
gammap results
The gamma p function is given by:
gammap = lowergamma(a, z)/gamma(a)
# NOT RUN { gammap(1, 3) gammap(1:3, 3) gammap(1, 1:3) # }
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