[英]find the signed minimum value in a three dimensional matrix in MATLAB
I have a 3D matrix d and I want to find the signed minimum value along the third dimension. 我有一个3D矩阵d,我想沿着第三维找到有符号的最小值。 Currently, I use following code 目前,我使用以下代码
tmp = abs(d);
[row, col]=ndgrid(1:size(d,1),1:size(d,2));
[v,ind] = min(tmp,[],3);
index = row + size(d,1)*size(d,2)*(ind-1)+ size(d,1)*(col-1); %turn the ind to index
dm = d(index); %get the signed minimum value
The above code does not so efficient. 上面的代码效率不高。 Does anyone know a better choice? 有谁知道更好的选择? Thank you! 谢谢!
无需创建row
和col
值的网格以将ind
转换为可用于索引回d
索引,您只需使用min
的第一个输出即可,该输出包含第三个维度上的最小值。
dm = min(abs(d), [], 3);
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