how to write this integration please

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MAHMOUD ALZIOUD 2018-10-19

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https://ww2.mathworks.cn/matlabcentral/answers/424995-how-to-write-this-integration-please

评论： MAHMOUD ALZIOUD 2018-10-19

integration.png

Dear All, I attached an image with a formula that I need to write in matlab but I do not know the right syntax, x ranges from zero to infinity, how can I write this integration please?

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madhan ravi 2018-10-19

Just try what you know and paste the code here to debug, seems to be an easy task.

MAHMOUD ALZIOUD 2018-10-19

编辑：MAHMOUD ALZIOUD 2018-10-19

在 MATLAB Online 中打开

i tried this but it is no working!
x=(0:100); %this is an example
  fun=(0.00001*x.^4-0.0003*x.^3+0.0093*x.^2-0.0843*x+0.1721)*(0.154*exp.(0.089*((x-9.911).^2))); %the first part of the integration
    q = integral(fun,2,50) % a required zone

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采纳的回答

madhan ravi 2018-10-19

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/424995-how-to-write-this-integration-please#answer_342314

编辑：madhan ravi 2018-10-19

在 MATLAB Online 中打开

syms x %requires symbolic toolbox
fun=(0.00001*x.^4-0.0003*x.^3+0.0093*x.^2-0.0843*x+0.1721)*(0.154*exp(0.089*((x-9.911).^2)));
int(fun,x,2,50) %erfi constant arises because of exponential function
double(int(fun,x,2,50))