extract row from a cell

Question

Alberto Acri 2023-6-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1984594-extract-row-from-a-cell

回答： Voss 2023-6-17

Hi! I generated a cell similar to this one:

a = {'home'};
b = {'ball' , 'cake' , 'ice'};
c = {'car','moto'};
d = {'money','supercar','toys'};
e = cell(4,0);
e(1,1:numel(a)) = a;
e(2,1:numel(b)) = b;
e(3,1:numel(c)) = c;
e(4,1:numel(d)) = d

I want to extract from cell "e" the first row consisting of three values.

In the case above, the second row of cell "e" consists of three values, one per column. I want to extract this second row.

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Answer 1

Voss 2023-6-17

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1984594-extract-row-from-a-cell#answer_1257854

在 MATLAB Online 中打开

a = {'home'};
b = {'ball' , 'cake' , 'ice'};
c = {'car','moto'};
d = {'money','supercar','toys'};
e = cell(4,0);
e(1,1:numel(a)) = a;
e(2,1:numel(b)) = b;
e(3,1:numel(c)) = c;
e(4,1:numel(d)) = d;
% construct a logical matrix the same size as e saying whether each
% corresponding cell of e is non-empty:
e_nonempty = ~cellfun(@isempty,e)
e_nonempty = 4×3 logical array
   1   0   0
   1   1   1
   1   1   0
   1   1   1
% find the first row of e that has three non-empty cells:
row = find(sum(e_nonempty,2) == 3,1)
row = 2
% extract that row of e:
result = e(row,:)
result = 1×3 cell array
    {'ball'}    {'cake'}    {'ice'}