for loop. finding the right index

Hello MATLAB community,

stateOfEnergy is a bunch of data in a column, and I found the largest increase and decrease of stateOfEnergy by utilizing the for loop and built-in <max> and <min>. But I am really struggling to find indices where the largest increase and decrease occured. Below is my code. Is therer any way you can find that specific indices?

stateOfEnergy = load('40815SOE.csv'); % in kiloWattHour

for i = 2 : length(stateOfEnergy)
    changeInSOE(i-1) = stateOfEnergy(i) - stateOfEnergy(i-1);
end

largestIncrease = max(changeInSOE); % largest increase of change in SOE in invertal of a single minute. in kWh

disp(['The Largest Increase in SOE was ', num2str(largestIncrease), 'kWh was found between index', ])

largestDecrease = min(changeInSOE); % % largest decrease of change in SOE in invertal of a single minute. in kWh

disp(['The Largest Decrease in SOE was ', num2str(largestDecrease), 'kWh was found between index', ])

Answer 1

[David Goodmanson]

Hello Ireedui,

max and min find the indices as well as the values.

changeInSOE = diff(stateOfEnergy)   % find all the differences
[valmax indmax] = max(changeInSOE)
[valmin indmin] = min(changeInSOE)

indmax = n says that the largest positive change of value = valmax occurred from stateOfEnergy(n) to stateOfEnergy(n+1).

indmin = m says that the largest negative change of value = valmin occurred from stateOfEnergy(m) to stateOfEnergy(m+1).

[Ireedui Ganzorig]

Thank you very much. You explained it very well. I got it. Thanks.