Specify columns inside a for loop

Hi

I would like to know if the code I attached will do the following: I want the value in the for loop to multiply by the price. But more specifically, I want this value to multiply by 10 if it is in the columns 1-8 and for the rest of the columns multiply by 15.

Thanks

for j=1:365

    for i=1:25

            if data(1,i)>=1 && data(1,i)<=8 
                price=10; 
            else
                price=15; 
            end

Answer 1

[Nathan Greco]

You are only checking of the data within any given column is between 1 and 8, which isn't what you describe to be wanting.

Just compare i's:

    if i >= 1 && i <= 8
       %...
    else
       %...
    end

I represents the columns you are iterating over, so you would want to test versus i.

Answer 2

[Chirag Gupta]

You might not need to use a for loop

 % rand data
 data = rand(365,25);
 % colums 1-8
 data(:,1:8) = data(:,1:8)*10;
 % colums 9 -25
 data(:,9:25) = data(:,9:25)*15;

[Nathan Greco]

True, but that's not what he asked.