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
Josh Williams 2020-3-15
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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Thiago Henrique Gomes Lobato
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
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
Thiago Henrique Gomes Lobato 2020-3-15
Size returns two values, so s(1) saves the first dimension in order to perform the loop and size assignment. It would be the same if you did:
s=size(a,1);
out=zeros(s,1);
...

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