# Calculating the average every three months

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desert_scientist90 on 24 Oct 2019
Edited: Artemio Soto Breceda on 24 Oct 2019
Hi all, I leaning matlab thru practice and patience, I have the following dataset with sunspot observations for 38 years. I am trying to get the average of months 12,1,2 per year. I was using the code below but I am getting the following error message. " Undefined operator '>=' for input arguments of type 'table'."
Any advise will be greatly appreciated.
IDX=data(:,3) >= 5;
fdata = data(idx,:);
iex = fdata(:,3) <= 7;
fildata = fdata(iex,:);
year = fildata(:,2);
avr = accumarray(year,fildata(:,1))./3;
idx = avr(:,1) > 0;
avr = avr(idx,1);

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desert_scientist90 on 24 Oct 2019

I used the import tool build up on matlab

desert_scientist90 on 24 Oct 2019
sunspot1(1:10, :)
ans =
10×3 table
Year month sunspot
____ _____ _______
1980 12 246.9
1981 1 156.6
1981 2 189.9
1981 3 196.6
1981 4 225.3
1981 5 194.7
1981 6 131.6
1981 7 205.3
1981 8 242.5
1981 9 245.3
Those are the results of that approach
Artemio Soto Breceda on 24 Oct 2019
Ah, thanks. I hadn't seen that you included your xlsx file in the post. See my answer below.

Artemio Soto Breceda on 24 Oct 2019
You have two options, to convert your table into an array with:
data_array = data{:,:};
or to use the same expression, but with curly braces, like this:
IDX = data{:,3} >= 5; % The curly braces do what you want