Averaging Multiple Matrices into a single matrix of same Dimensions
2 次查看(过去 30 天)
显示 更早的评论
I am generating a matrix of 5x455832 dimensions. I want to generate it for a total of 500 times and want to take the average matrix and use it for further calculations.
1 个评论
采纳的回答
Steven Lord
2023-8-17
Making a 3-dimensional array this size does consume a good chunk of memory, but if you have it available storing the matrices as pages of that array then calling mean over dimension 3 is an option. I'm creating random data in the example, but you could preallocate A using the zeros function and fill it in with your real data.
A = rand([5, 455832, 500]);
S = mean(A, 3);
Alternately you could keep two matrices around, one of your data and one accumulator. At each step where you create your data matrix, add it to the accumulator. At the end, divide by the number of steps. I'm using the same random data array and considering each page to be what was "created" at each step.
S2 = zeros(5, 455832);
n = 500;
for whichstep = 1:n
generatedData = A(:, :, whichstep);
S2 = S2 + generatedData;
end
S2 = S2 / n;
whos A S S2
Let's check that S and S2 gave the same results.
check = norm(S-S2)
0 个评论
更多回答(0 个)
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Logical 的更多信息
产品
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!