Why does the Index exceeds the number of array elements

Im trying to run through total Force which is a 921x1 Double and check if the next value in that array is larger or greater if larger i want to subtract 0.01 from c and if smaller I want to add 0.01 to c and c starts at zero. Why does it exceed the index? Any Help would be greatly Appreciated Thanks!

for j = 1:length(TotalForce) 
    if j <= length(TotalForce)
        if TotalForce(j) >= TotalForce(j+1)
        c = c + 0.01 ;
        elseif TotalForce(j) <= TotalForce(j+1)  
        c = c - 0.01 ; 
        end 
    end
end

Answer 1

[Geoff Hayes]

Wilfredo - take a look at these lines

for j = 1:length(TotalForce) 
    if j <= length(TotalForce)
        if TotalForce(j) >= TotalForce(j+1)

If j happens to be the length of the TotalForce array, then j+1 will be an invalid index into your array. Try doing something like

for j = 1:length(TotalForce)-1
    if TotalForce(j) >= TotalForce(j+1)
        c = c + 0.01 ;
    else
        c = c - 0.01 ; 
    end 
end

[Wilfredo Huaman]

Thank you Worked Great!