description to solve equation involved integration

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Tu Nguyen
Tu Nguyen 2022-2-12
评论： Rik 2022-2-15
Hi everyone, I have a question:
g(u) = inline('sqrt(2*pi*(delta)^2)*exp(-2*(pi^2)*(delta^2).*(u.^2))','u');
delta = [-1:0.001:1];
g(u) = 0.95;
integral g(u) with lower limit = -1/(2*x) and upper limit = 1/(2*x);
How can I express the integral(u) in Matlab to solve for x ;
Please help me
  1 个评论
Rik
Rik 2022-2-15
Regarding your email ("Do you have an email?"):
Yes I do. If you have a question, post it on this forum. If you want to make sure I see your question, feel free to send me the link. Other than that I prefer to only be contacted about my File Exchange submissions.

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采纳的回答

David Hill
David Hill 2022-2-12
I am somewhat guessing this is what you want. Execution might take a few minutes. Reduce the delta array for faster execution.
syms x u
delta=-1:.001:1;
A=zeros(size(delta));
for k=1:length(delta)
g = sqrt(2*pi*(delta(k))^2)*exp(-2*(pi^2)*(delta(k)^2)*(u^2));
eqn=int(g,u,-1/(2*x),1/(2*x))==.95;
A(k)=vpasolve(eqn,x);
end

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