understand if the cell is composed of all null elements

Question

Alberto Acri 2023-7-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2001007-understand-if-the-cell-is-composed-of-all-null-elements

回答： Steven Lord 2023-7-26

采纳的回答： Steven Lord

cc.mat

在 MATLAB Online 中打开

Hi! How can I understand if the cell consists of all null elements? I tried this way but it doesn't seem to work:

CC = cell([3 7]);
empty_cell = ~isempty(CC); % result 1

or

load cc.mat
empty_cell = ~isempty(CC); % result 1 ?

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Answer 1

Steven Lord 2023-7-26

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2001007-understand-if-the-cell-is-composed-of-all-null-elements#answer_1279277

在 MATLAB Online 中打开

MATLAB is returning the correct result. The cell array is not empty, its size vector does not contain a 0.

C = cell(1, 5)
C = 1×5 cell array
    {0×0 double}    {0×0 double}    {0×0 double}    {0×0 double}    {0×0 double}
C{3} = 1:10
C = 1×5 cell array
    {0×0 double}    {0×0 double}    {[1 2 3 4 5 6 7 8 9 10]}    {0×0 double}    {0×0 double}
isempty(C) % false
ans = logical
   0
size(C)
ans = 1×2
     1     5

The cells inside the cell array in this case are empty. One way to determine this is to use cellfun.

identifyEmptyCells = cellfun(@isempty, C)
identifyEmptyCells = 1×5 logical array
   1   1   0   1   1

Depending on what question you want to ask, passing identifyEmptyCells into the any or all functions may be your next step.

areAllTheCellsEmpty = all(identifyEmptyCells, 'all')
areAllTheCellsEmpty = logical
   0
areAnyOfTheCellsEmpty = any(identifyEmptyCells, 'all')
areAnyOfTheCellsEmpty = logical
   1