Using a for loop to extract values from a matrix

Hello!

I have a 5x12 matrix. The purpose of the matrix is to show different temperatures during every month of a year in 5 different cities

A = [ 1 2 3 4 5 6 7 8 9 10 11 12 ; 1 2 3 4 5 6 7 8 9 10 11 12 ; 1 2 3 ... an so on]

Now what I want to do is "seperate" temperatures that are under a certain degree, for example if the temperature drops under 4 degrees celsius i want this to be displayed in the command window.

I should showcase temperatures of 1 2 3 for all the 5 cities.

I tried something like this:

for i =  A(1:end)
    if i < 4
        disp('To cold')
    end
end

I do not resive any error messages, but nothing happens, at all. It's obvious my MatLab skills are non existant so I'd really appriciate the help!!

Answer 1

[Cris LaPierre]

Typically this is done using your loop counter to index into your vector.

You can learn more about indexing in Ch 5 of MATLAB Onramp. Of course, you will need to set up your for loop correctly so that the loop counter is meaningful. See Ch 13 for that.

[Lovisa Norlin]

Thank you! I will check it out!