Calculating an average if specific condition is fulfilled

Hello everybody,

I am working on my own project right now and needing some help now.

What do I want to do?

Matlab should calculate the average out of values for a specific time period.

time (sec) value

0 2

1 3

2 4

3 6

4 7

5 8

6 2

If time is >0 and smaller or equal to 3 sec Matlab should calculate the arithmetic average of the values.

So basically something like this:

IF 0>=time>=3

Do arithmetic average of value

So the result should be (2+3+4+6 )/4 =3,75.

It is my first project with MatLab and I am usually working with other programms.

Thanks for your help.

Your sincerely,

Max

Answer 1

[madhan ravi]

https://in.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html - read the topic logical indexing once you understand that use mean() after that process.

I also suggest you to do MATLAB on-ramp course.

[Max Behr]

Thank you for your reply!

I got 10 data sets. For each testing I got times and values.

Can I do it like this:

time1 = 0 1 2 3 4 5 6
values1 = 0 1 2 3 4 5 6
time2 = 0 1 2 3 4 5 6 7 8
values2= 0 1 2 3 4 5 6 7 8

>>mean(values1(0<time1<3)
>>mean(values2(0<time2<4)

And so on?

And can you recommend me tutorial for beginners? So that I can work through the programm?

Thank you again.

[madhan ravi]

https://matlabacademy.mathworks.com - do this course, only takes a couple of hours (so that you don't have to depend on anyone often).

Don't name your variables dynamically see https://in.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval to know why. Use a cell array for intance:

time=cell(2,1);
time{1}=...
time{2}=...

[Max Behr]

Thanks for your answer :)

so for my project it would be like this?

time=cell(10,1)

Do I need to change the second number to the amount of time values? Or does Matlab do it automatically?

I will start with the course and if I have some questions I will come back and ask theme here :)

[madhan ravi]

Experiment and get back.

[Max Behr]

I have one more question...

What should I do if the amout of values are NOT the same?

time1= 1 2 3 END

time 2 = 1 2 3 4 5 END

values1= 4 5 6 END

values2 1 2 4 5 6 END

Should I still put them into one matrix?

[madhan ravi]

time=cell(2,1);
time{1} =[ 1 2 3 ]
time{2} =[ 1 2 3 4 5 ]