Vectors not the same length

Question

Roshaan Rauf 2021-4-12

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https://ww2.mathworks.cn/matlabcentral/answers/800126-vectors-not-the-same-length

回答： Cris LaPierre 2021-4-12

i cant seem to fix my problem i am calculationg acceleration from a column of time and speed and later on i need to plot some graphs so the vectors need to be the same length,however when i calculate acceleration, there are two less values then time.

dataAccel = []; %Create empty array to store acceleration values in

for i = 1:1:length(Time) %Create a loop that continues up until the last value of time in the column

if i < length(Time)-1%Stop error occuring from the the code continuing on longer then the array

ChangeinTime = Time(i+1)- Time(i); % Calculates the time difference

ChangeinSpeed = Speed(i+1)-Speed(i); % Calculates the speed difference

Acceleration = ChangeinSpeed/ChangeinTime; %Calculates Acceleration

dataAccel = [dataAccel;Acceleration]; %Stores acceleration in empty array

end

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Answer 1

Cris LaPierre 2021-4-12

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If there are less items in Speed then Time, then your if statement should use length(Speed) instead. However, that may not always be the case. Perhaps use the min length from either?

for i = 1:min(length(Time),length(Speed)) %Create a loop that continues up until the last value of time in the column
    ChangeinTime = Time(i+1)- Time(i); % Calculates the time difference
    ChangeinSpeed = Speed(i+1)-Speed(i); % Calculates the speed difference
    Acceleration = ChangeinSpeed/ChangeinTime; %Calculates Acceleration
    dataAccel = [dataAccel;Acceleration]; %Stores acceleration in empty array   
end