# Hypergeometric Function in Matlab

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P Maity 1 Jun 2020
댓글: P Maity 1 Jun 2020
Can somebody help me to write the hypergeometric fucntion in code form?

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KSSV 1 Jun 2020
Where is the formula for F0?
P Maity 1 Jun 2020
I think matlab has in-build hypergeometric fucntion and I have to call that which is one of the standard generalized hypergeometric fucntion of this order .

### 채택된 답변

David Goodmanson 1 Jun 2020
Hello PM,
The variable l does not come out so well in this font so I'll call it q instead. SInce both -q and -n are negative, the series terminates and is a polynomial. The function 2F0(z) is defined as
Sum{j} (gamma(j-q)*gamma(j-n) / ( gamma(-q)*gamma(-n)*j! ) *z^j
and with the important identity
gamma(j-q) / gamma(-q) = q! / (q-j)! * (-)^j [using ! does something funky to the type color]
you can arrive at
Sum{j} (factorial(q)*factorial(n)) / (factorial(q-j)*factorial(n-j)*factorial(j)) * (1/c).^j
The last term in the series occurs when either q-j is zero or n-j is zero, whichever comes first. So you can put this expression into a for loop in j, which runs from j = 0 to j = min(q,n).

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P Maity 1 Jun 2020