Matrix summation rounding error?
1 回表示 (過去 30 日間)
古いコメントを表示
Dear all,
I'm having trouble with summation of matrices and difference of the two sum. Here some lines of code:
thetaMN_prev = cellfun(@nansum, theta_prev);
cost_prev = sum(thetaMN_prev,'all');
thetaMN_try = cellfun(@nansum, theta_try);
cost_try = sum(thetaMN_try,'all');
cost_prev - cost_try often returns 0, while
sum(thetaMN_try - thetaMN_prev,'all') ~= 0, but this should be the same calculation mathematically speaking.
When this happens, cost_try and cost_prev are of the order of 1e19.
Is this an error due to some rounding process in function sum(A,'all')?
0 件のコメント
回答 (0 件)
参考
カテゴリ
Help Center および File Exchange で Creating and Concatenating Matrices についてさらに検索
製品
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!