unknown code- understand it up to the for loop but am lost from there. Can anyone lend a hand? thanks.

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Josh Williams 2020-3-15

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https://ww2.mathworks.cn/matlabcentral/answers/510956-unknown-code-understand-it-up-to-the-for-loop-but-am-lost-from-there-can-anyone-lend-a-hand-thank

编辑： Image Analyst 2020-3-15

dat=load('data.dat')
a=dat(:,1)
b=dat(:,2)
s=size(a)
s=s(1)
out=zeros(s,1)
for n=1:s
	out(n)=(b(n+1)-b(n-1))/(a(n+1)-a(n-1))
end
c=[a out]

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Answer 1

Thiago Henrique Gomes Lobato 2020-3-15

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https://ww2.mathworks.cn/matlabcentral/answers/510956-unknown-code-understand-it-up-to-the-for-loop-but-am-lost-from-there-can-anyone-lend-a-hand-thank#answer_420212

What the code was supposed to be? it looks like the variable out is suppose to be the numerical derivative of b with respect to a. If the distance between each "a" is uniform and increasing, than this is the central scheme for 1st order differentiation with 2nd order accuracy and the line describe basically

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Josh Williams 2020-3-15

not too sure what the code is supposed to be, thats what i have been tasked to find out. I can see now where your coming from with the derivations though. what does the line s=s(1) do?

Thiago Henrique Gomes Lobato 2020-3-15