Bessel function values using starting values

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Prajakta Borse 2021-8-29

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https://ww2.mathworks.cn/matlabcentral/answers/1442904-bessel-function-values-using-starting-values

评论： Yongjian Feng 2021-8-30

I wish to calculate values of bessel function of first kind using starting values of j(1,1) and 
j(1,2).
j(1,2)=0.44005
j(1,1)=0.76519
for n=2:9
    j(1,n+1)=2*n*j(1,n)-j(1,n-1);
end

The above code do not give correct or even values close to the exact values.
I dont understand what is wrong with this code.

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回答（1 个）

Yongjian Feng 2021-8-29

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https://ww2.mathworks.cn/matlabcentral/answers/1442904-bessel-function-values-using-starting-values#answer_776609

matlab has built-in function. Compare against it.

https://www.mathworks.com/help/matlab/ref/besselj.html

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Prajakta Borse 2021-8-30

Is it possible to do this computation without using built-in function?

Yongjian Feng 2021-8-30

Of course you can do it yourself. Here the point is that you can compare your result against the answer from the built-in function. This can help you to debug your function.

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