如何在MATLAB中将元胞数组中不同长度的向量组合成矩阵 [英] How to combine vectors of different length in a cell array into matrix in MATLAB

问题描述

如何有效地将不同长度的元胞数组向量组合成一个矩阵，用 0 或 NaN 将向量填充到最大长度?对于 cell2mat() 来说，这将是一个不错的选择.

How to efficiently combined cell array vectors with different length into a matrix, filling the vectors to max length with 0s or NaNs? It would be a nice option for cell2mat().

例如，如果我有

C = {1:3; 1:5; 1:4};

我想要一个

M = [1 2 3 0 0
     1 2 3 4 5
     1 2 3 4 0];

或

M = [1 2 3 NaN NaN
     1 2 3 4 5
     1 2 3 4 NaN];

推荐答案

对于 row 向量的单元格，如您的情况，这将用零填充向量以形成矩阵

For a cell of row vectors as in your case, this will pad vectors with zeros to form a matrix

out=cell2mat(cellfun(@(x)cat(2,x,zeros(1,maxLength-length(x))),C,'UniformOutput',false))

out =

     1     2     3     0     0
     1     2     3     4     5
     1     2     3     4     0

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A 类似的问题今天早些时候被问到，尽管问题是措辞略有不同，我的答案基本上满足您的需求.

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A similar question was asked earlier today, and although the question was worded slightly differently, my answer basically does what you want.

复制这里的相关部分，一个不均匀列向量的单元格可以用零填充到一个矩阵中:

Copying the relevant parts here, a cell of uneven column vectors can be zero padded into a matrix as:

out=cell2mat(cellfun(@(x)cat(1,x,zeros(maxLength-length(x),1)),C,'UniformOutput',false));

其中 maxLength 假定已知.在您的情况下，您有行向量，这只是对此稍作修改.

where maxLength is assumed to be known. In your case, you have row vectors, which is just a slight modification from this.

如果 maxLength 不知道，你可以得到它

If maxLength is not known, you can get it as

maxLength=max(cellfun(@(x)numel(x),C));

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