更改单元格阵列Matlab的格式 [英] Change the format of a cell array Matlab

问题描述

我有一个A，它是640x1的单元格，其中每个单元格A(i,1)的值随行而异，例如:

I have a A which is 640x1 cell, where the value of each cell A(i,1) varies from row to row, for example:

A(1,1)=[]
A(2,1)=[1]
A(3,1)=[1,2,3]

我想做的就是将A转换成这样:

What I want to do is to convert A to be like this:

A(1,1)=[]
A(2,1)=1
A(3,1)=1; A(3,2)=2; A(3,3)=3

，以便每个单元格只有一个值.因此，如果有人可以帮助我，我该怎么做?这是A外观

so that each cell has only one value. So if anyone could assist me how can I do this? This is a part of who A looks like

A=
[]
0
0
0
145
[144;192]
[145;197;307]

推荐答案

示例:

% first lets create some random cellarray containing data of different length
A = cell(10,1);
for i=1:numel(A)
    A{i} = rand(1,randi([0 5]));
end

% determine the maximum number of columns
colnum = max(cellfun(@numel, A));

% create new cellarray, and fill each row
B = cell(numel(A),colnum);
for i=1:numel(A)
    if isempty(A{i}), continue; end
    B(i,1:numel(A{i})) = num2cell(A{i});
end

所以我有第一个单元格数组:

So I had the first cell array as:

>> celldisp(A)
A{1} =
    0.2217    0.1174    0.2967    0.3188
A{2} =
    0.5079    0.0855
A{3} =
    0.8010
A{4} =
     []
A{5} =
    0.7303    0.4886    0.5785    0.2373    0.4588
A{6} =
    0.5468    0.5211    0.2316    0.4889    0.6241
A{7} =
    0.3955    0.3674    0.9880    0.0377
A{8} =
    0.9133    0.7962    0.0987    0.2619    0.3354
A{9} =
    0.1366    0.7212    0.1068    0.6538
A{10} =
    0.7791    0.7150

变成了:

>> B
B = 
    [0.2217]    [0.1174]    [0.2967]    [0.3188]          []
    [0.5079]    [0.0855]          []          []          []
    [0.8010]          []          []          []          []
          []          []          []          []          []
    [0.7303]    [0.4886]    [0.5785]    [0.2373]    [0.4588]
    [0.5468]    [0.5211]    [0.2316]    [0.4889]    [0.6241]
    [0.3955]    [0.3674]    [0.9880]    [0.0377]          []
    [0.9133]    [0.7962]    [0.0987]    [0.2619]    [0.3354]
    [0.1366]    [0.7212]    [0.1068]    [0.6538]          []
    [0.7791]    [0.7150]          []          []          []

我们将元素作为2D单元格数组进行访问:

where we access elements as a 2D cell array:

>> B{5,3}
ans =
    0.5785

---

这里的实现略有不同:

---

Here is a slightly different implementation:

len = cellfun(@numel, A);
padding = arrayfun(@(n)cell(1,n), max(len)-len, 'UniformOutput',false);
B = cellfun(@num2cell, A, 'UniformOutput',false);
B = cellfun(@(b,pad) [b{:} pad], B, padding, 'UniformOutput',false);
B = cat(1, B{:});

---

请注意，以上代码将返回2D 单元格数组.这是因为常规数值矩阵不能加锯齿(所有行的长度必须相同).

---

Note that the above will return a 2D cell array. This is because regular numeric matrices cannot be jagged (all rows must have the same length).

如果要获取二维数字矩阵，则必须插入NaN值作为填充符:

If you want to get a 2D numeric matrix, you'll have to insert NaN values as fillers:

C = B;
C(cellfun(@isempty,C))= {NaN};
C = cell2mat(C)

输出:

>> C
C =
    0.2217    0.1174    0.2967    0.3188       NaN
    0.5079    0.0855       NaN       NaN       NaN
    0.8010       NaN       NaN       NaN       NaN
       NaN       NaN       NaN       NaN       NaN
    0.7303    0.4886    0.5785    0.2373    0.4588
    0.5468    0.5211    0.2316    0.4889    0.6241
    0.3955    0.3674    0.9880    0.0377       NaN
    0.9133    0.7962    0.0987    0.2619    0.3354
    0.1366    0.7212    0.1068    0.6538       NaN
    0.7791    0.7150       NaN       NaN       NaN

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