for loop to sum values

I need to sum the value of

row column + row column + ... + row column

1 6,7,8 145 6,7,8 ... 6,7,8

2 6,7,8 146 6,7,8 ... 6,7,8

3 6,7,8 147 6,7,8 ... 6,7,8

... 6,7,8 ... 6,7,8 ... 6,7,8

144 6,7,8 288 6,7,8 52560 6,7,8

X=zeros(1,3);

x = 365
for i = 1:length(outDates(:,5))
    avgspeeds = zeros(1,3);
    for j = 1:3 
        sum1 = outDates(i,5+j) + outDates(i+n,5+j)
    end 

end

[KSSV]

Read about sum

[zhi cheng]

thank you for your reply, but I still dont get it from the info in helpcenter talk about how to sum the whole row/column

but I need to sum specific rows and columns eg: row1,row145,row289,row433.... there is a gap of 144rows between them and sum

row2,row146,row290,row434

row3,row147,row291,row435

so on until row 144

and the columns from 6-8

Answer 1

[Jan]

what about the answer given to your similar question: https://www.mathworks.com/matlabcentral/answers/1826808-sum-of-values-in-matrix-with-a-loop#answer_1075888

No loop needed:

X = reshape(outDates(:, 6:8), 144, [], 3);  % Reshape to 3D array
Y = squeeze(sum(X, 2) / size(X, 2));        % Mean over 2nd dimension

Answer 2

[Torsten]

outDates = rand(52560,9);
sums = zeros(144,1);
for i=1:144
    sums(i) = sum(outDates(i+(0:364)*144,6)) + sum(outDates(i+(0:364)*144,7)) + sum(outDates(i+(0:364)*144,8));
end
sums

sums = 144×1

547.5205 549.0608 553.0107 551.1408 534.0514 551.2122 553.6387 539.5439 546.9188 536.9660

Answer 3

[Abdullah Emir]

thank you