I want to graph R vs. g for n=0,1 and 2.

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reem123 2023-3-28

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https://ww2.mathworks.cn/matlabcentral/answers/1937009-i-want-to-graph-r-vs-g-for-n-0-1-and-2

评论： John D'Errico 2023-4-3

I want to graph R vs g for g=[0, 0.5]

Y axis is restricted (0 to 0.25)

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Torsten 2023-3-29

编辑：Torsten 2023-3-29

在 MATLAB Online 中打开

(6*n-1)!! = (6*n)! /( 2^(3*n) * (3*n)! )

Section "Relation to the factorial" under

https://en.wikipedia.org/wiki/Double_factorial

John D'Errico 2023-4-3

As a hint, I would compute each term as the sum of the logs of each part of those elements. Only at the end do you exponentiate the result. If not, expect to rapidly see underflows or overflows, or maybe both at once.

As a second hint, how do you compute the log of a factorial? The simplest way is to use the relationship of the factorial to the gamma function, and to then realize that MATLAB provides the function gammaln, which computes the natural log of the gamma function.

Alternatively, you would find that Stirling's approximation is actually quite accurate for the factorial, and it is easily logged. Or, you could compute the log of a factorial as the sum of the logs of the integers in the necessary product. Even so, just use gammaln.

Finally, Torsten gave you a relation for the double factorial

In the end though, you need to put it together as this is your assignment, not ours. At the very least, you need to make a credible effort.

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