normalization of cell arrays

Question

yasmine 2012-1-6

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/25506-normalization-of-cell-arrays

Hi

i want to normalize the values in a cell array called G

G is partitioned into 6 blocks (cell arrays) so i want to normalize each block separately (G{i,j}), each block is of size 128X128

Gmin = min((G(:))); 
Gnorm = (G - Gmin) ./ (max(G1{:,:}) - Gmin);

i tried this:

Gmin(i,j)=min(G{i,j});

but i got this error:

??? Undefined function or method 'min' for input arguments of type 'cell'.
Error in ==> DOC at 124
        Gmin(i,j)=min(G{i,j});

any suggestions please ???

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2012-1-6

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/25506-normalization-of-cell-arrays#answer_33435

在 MATLAB Online 中打开

Gmin = cellfun(@(M) min(M(:)), G, 'Uniform', 0);
Gmax = cellfun(@(M) max(M(:)), G, 'Uniform', 0);
Gnorm = cellfun(@(M,minM,maxM) (M-minM) ./ (maxM-minM)), G, Gmin, Gmax, 'Uniform', 0);

This relies on two uncommon usages:

deliberately returning a cell array when the results would fit in a vector
passing multiple cell arrays in to cellfun(), knowing that the corresponding elements will be extracted from each and passed to the function handle

There are other ways of coding this, such as using arrayfun()