How to calculate mean to an equal area in Matlab?

I have 900000 time data and 900000 speed data. I need to calculate the mean speed for each 30secs and plot them. How can I get that? Thank you!

[James Tursa]

Running average, or average of blocks? Is the time data equally spaced?

[Xuefei Sun]

Yes, the time data is equally spaced from 1 sec to 900000 sec. And I should calculate mean speed for each 3 sec. Like from 1 to 3, 4 to 6, 7 to 9, ect. And plot them

Answer 1

[James Tursa]

n = 3; % or whatever number of samples you need, must be divisible into size of data
time_average = mean(reshape(time_data,n,[]));
speed_average = mean(reshape(speed_data,n,[]));
plot(time_average,speed_average)

[Xuefei Sun]

Thank you! That's what I am looking for.

[Xuefei Sun]

But I still have another problem. If I block the time, it seems like the mean speed responding to a certain time(the mean time). But I want to plot the speed sustained in that 3 sec. I mean I want to plot a stragnt line in each 3 sec. Could you teach me how to do that?

[Xuefei Sun]

I delete mean for the time_average, and I got it then. Thank you so much.

time_average = reshape(time_data,n,[]);

speed_average = mean(reshape(speed_data,n,[]));

plot(time_average,speed_average)