Question about initial value problem
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I really do not understand what this question says to me. In those quarantina days, I am trying to learn matlab by myself by using Tobin's book. thus, I have no body to ask directly this question. Therefore, I posted this question without any my solution trial. sorry for that. any help, any suggestion any hint to give a way to solve this question will become very useful for me. Many thanks.
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Ameer Hamza
2020-4-21
编辑：Ameer Hamza
2020-4-21
This question is similar to the one you posted earlier from this book, but this time, instead of giving a function handle as input, we are only giving vectors x and y. The interquad function does not know the input function and just need to rely on these data points to find the integral. To guess the value at a point, not in vector x, we use interpolation. Try the following code to
x = 0:0.01:1;
y = x.^2;
a = interquad(x, y);
function Q = interquad(x, y)
f = @(xq) interp1(x, y, xq, 'pchip'); % phicp is recommended instead of cubic
Q = quad(f, x(1), x(end));
end
It creates vectors x, and y from function 
on the interval 
. The output is as follow
on the interval . The output is as followa =
0.3333
It is same as integral of on interval 0 to 1.
on interval 0 to 1.2 个评论
Zeynep Toprak
2020-4-21
Ameer Hamza
2020-4-21
I am glad to be of help. Check my answer on that question.
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