Simpsons rule function error

Question

Oliver Wilson 2021-3-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/787309-simpsons-rule-function-error

编辑： Oliver Wilson 2021-4-9

Ive attempted to code Simpsons Rule

and this my code

with x(1) and x(2) the lower and upper bounds. However for some reason with the following input "S = simpson_rule( @sin, [0,pi], 10 )" i get the same error saying the index exceeds the number of array elements. This problem seems to disappear when i remove f(x(2)) from my code in the final sum. Any suggestions would be great

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Answer 1

the cyclist 2021-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/787309-simpsons-rule-function-error#answer_661919

在 MATLAB Online 中打开

In this line of code:

x=x(1)+h*(2*k-1);

you have set x to a scalar value, so when you try to access x(2) in this line of code:

S=h*(f(x(1))+f(x(2))+4*s1+2*s2)/3;

that 2nd element does not exist.

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Oliver Wilson 2021-3-29

Thank you very much but im a novice and unsure of how to fix this so any suggestions would be great

the cyclist 2021-3-29

My suggestion would be to comment your code, to state exactly what you intend it to be doing.

That will help other (and you!) understand what is supposed to be happening with the code, and perhaps understand why what you intend is not what the code is actually doing.

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