Threshold the matrix with vector

1 次查看（过去 30 天）
Aravin
Aravin 2012-10-8
Let say I have a matrix M with m x n dimensions. I want to threshold each column by different threshold. let say N contains the threshold for each column, therefore the dimension of N is n x 1 or 1 x n.
how can I do this by single command.

请先登录，再回答此问题。

采纳的回答

Junaid
Junaid 2012-10-8
One possible way is ..
lets us assume that N is 1 x n vector
N = repmat(N,size(M,1),1);
M_binary = M > N;
or
M_binary = M < N;

更多回答（1 个）

Wayne King
Wayne King 2012-10-8
编辑：Wayne King 2012-10-8
A = randn(5,3);
n = [0.5 0.8 0.2];
thresh = bsxfun(@gt,A,n);
B = A.*thresh;
B contains nonzero elements only where elements in A exceed the thresholds in the vector n.
  2 个评论
Aravin
Aravin 2012-10-8
Thanks Wayne, but it is not giving me 0 1 matrix as after thresholding B should be binary ???
Wayne King
Wayne King 2012-10-8
thresh is the 0 1 matrix just as I describe above

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Image Thresholding 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by