How to find average value of every 10 numbers within a set of numbers?

n=fix(length(speed)/10);
avgspeed = zeros(n,1);
for i=length(speed):-10:1
    for j=cumsum(speed(i:i+9))/10
        avgspeed(i) = j;
    end
end
fprintf ('The average speed of every 10 elements is:')
disp (avgspeed)

When I run the script, this is the error I get.

>> average10speed
Index exceeds the number of array elements (452).

Error in average10speed (line 5)
    for j=sum(speed(i:i+9))/10

The purpose of this code is to take a data set, and put it into pieces of 10, average them, so I can find the average of every 10 elements and then eventually plot that data. So I was hoping it would come out of the script as a vector, and not a display of each average as one number individually.

Here speed is a list of a lot of different amount of speeds on a run ranging from 0 to about 5m/s.

How can I get it to be put into one vector? so I can then plot it?

Answer 1

[Cris LaPierre]

The problem is how you set up your loops.

The first value of i is the length of speed, 452. The first value of j is trying to index the values i:i+9, or 452:461. Since that is indexing a value larger than the variable, it returns an error.

You might try

for i=length(speed):-10:1
    j=cumsum(speed(i:max(i-9,1)))/10 
end