how edit code in matlab

how edit code matlab for change some comments

[Walter Roberson]

That image is too small and too faint for me to read. Please post a more legible version. Assume that some of us are half blind.

[James Tursa]

Do you have a specific function you are working with?

Answer 1

[Walter Roberson]

sum( abs(diff(f(x))) .* diff(x) )

Answer 2

[John BG]

assuming you have sampled often enough to catch the true max min values, to avoid missing max or min when searching for U and L within [x(i) x(i+1)] then define reference vector x

x=[0:.1:10]
f=@(x) sin(x)
y=f(x)

z=zeros(1,length(x)-1)
for i=2:length(x)
z(i)=(max(y(i),y(i-1))-min(y(i),y(i-1)))*(x(i)-x(i-1))
end
sum(z)

redefine x and the function f to your values of interest.

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thanks in advance

John

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