Change in odometer.

Question

Ireedui Ganzorig 2020-3-16

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/511070-change-in-odometer

评论： Ireedui Ganzorig 2020-3-16

Hello MATLAB community

I am trying to find the Change in Odometer, and below is my code. Odometer here is a bunch of data in a column. I feel like my i should start from 1, but when I make the i equals to 1, I am getting an error says indices are not the same. Can anyone help me fix this problem by making the i equals to 1?

Odometer = load('40815Odometer.csv'); % in miles
for i = 2 : length(Odometer+1)
    changeInOdometer = Odometer(i) - Odometer(i-1)
end
ChangeInOdometer = changeInOdometer - Odometer(1)

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Answer 1

Sriram Tadavarty 2020-3-16

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Hi Ireedui,

It looks like you wanted to get the difference of two consecutive odometer readings.

The diff function will help in this case. Here is the documentation link for diff function: https://www.mathworks.com/help/matlab/ref/diff.html

% For example Odometer has values [5 9 6 3];, Change in odometer readings will be 4 -3 -3
ChangeInOdometer = diff(Odometer);
% if you wanted even to store the first value,
ChangeInOdometer = [Odometer(1) diff(Odometer)];

To work off your code

% If you only wanted the diff
Odometer = load('40815Odometer.csv'); % in miles
for i = 2 : length(Odometer)
    changeInOdometer(i-1) = Odometer(i) - Odometer(i-1)
end
% If you want to store the first value
Odometer = load('40815Odometer.csv'); % in miles
changeInOdometer(1) = Odometer(1);
for i = 2 : length(Odometer)
    changeInOdometer(i) = Odometer(i) - Odometer(i-1)
end