How do i create a loop finding the mean value of many variables?

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Eddie Bazinet 2016-12-2

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回答： Vishal Neelagiri 2016-12-5

I was given an assignment to find the mean value for the percentage ice coverage on a lake for each day recorded over 6 years( 2010-2015). Since there are about 150-200 days to find this value for, I would like to use a loop, but I'm unsure of how I would make a loop that would do this.

An example of my data is for day 365 on lake erie i have values of 10.11, 12.02, 22.03, 15.06, 14.33, 16.66 for 2010-2015 respectively. The expected result for this day would be 15.035(add up all the values and divide by the number of values.)

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Andrei Bobrov 2016-12-2

Please attach small example of the your data. And example of the expected result.

Guillaume 2016-12-2

Since there are so many days to find this value for, I need to use a loop

Probably not. In fact, it's probably harder to do it with a loop. However, since you haven't specified what sort of form your input data takes, it's difficult to say.

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Answer 1

Vishal Neelagiri 2016-12-5

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Let's assume that you have 200 days per year that you would like to find this average value for. You need to first organize this data into a 200*5 array where each column represents the ice coverage for all the 200 days in a particular year. So, the rows represent the days (200) and the columns represent the years (2010-2015, that is 5). Once this is done you can use the following code to calculate the average value for a particular day:

% Assume the variable ice_data is a 200*5 array consisting of the data
avg_value = mean(ice_data,2);
% This calculates the mean of each row in the ice_data variable and stores it in avg_value matrix

You can refer to this documentation link for additional information on the mean function:

https://www.mathworks.com/help/matlab/ref/mean.html