number of values greater than zero in a large matrix
13 ビュー (過去 30 日間)
古いコメントを表示
I have a 900X25 matrix The matrix has rows of zeros with one or two numeric values. Some rows have all zeros. What I want to do is have Matlab go through each row of zeros and find the lowest numeric value in that row, or if there is all zeros in that row, then the code will just skip that row. I want the code to return a 1X25 or a 25X1 array which will let me know the number of times there was a numeric value in each column. And not counting the larger numbers if there were more than one number in a given row. Example of data:
Grandmatrix = 23 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 87 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 93 12 0 0 0 0 0 0 0 0 0 0 0 0 0
Reducedmatrix = 1 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 0 0 0 0
4 件のコメント
Sean de Wolski
2012 年 6 月 18 日
Andrei and I are clearly missing the point. ZCould you give us a small example (3x3 maybe) and explain.
回答 (3 件)
Andrei Bobrov
2012 年 6 月 18 日
Reducedmatrix = any(Grandmatrix);
or?
Reducedmatrix = sum(Grandmatrix~=0);
0 件のコメント
Walter Roberson
2012 年 6 月 18 日
sum(GrandMatrix == repmat( min(GrandMatrix,2), 1, size(GrandMatrix,2) ))
2 件のコメント
Walter Roberson
2012 年 6 月 19 日
Dang, I keep forgetting about the other argument to min()
sum(GrandMatrix == repmat( min(GrandMatrix,[],2), 1, size(GrandMatrix,2) ))
参考
製品
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!