MATLAB
`Fas = hyper2f3as(B,D,z)`

Asymptotic approximation of \$_2F_3({B},{D},-{z})\$, z >> 1. This routine calculates the asymptotic expression for the generalized hypergeometric funcion for the case for which there are two numerator parameters and three denominator parameters. The asymptotic expression approximates \$_2F_3({B},{D},-{z})\$ when Z is large and positive.

 Parameters Description B [vector] Vector of numerator parameters, must have length 2 D [vector] Vector of denominator parameters, must have length 3 z [vector] Values for which the hypergeometric function is to be evaluated. The values in z that are passed into the routine should be positive; the function values calculated will be asymptotic approximations for \$_2F_3({B},{D},-{z})\$.
 Return Values Description Fas [vector] Asymptotic approximations for \$_2F_3({B},{D},-{z})\$

• Y. L. Luke, The Special Functions and Their Approximations. New York,: Academic Press, 1969.

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