通过多次合并同一行向量来构建矩阵 [英] Building a matrix by merging the same row vector multiple times

问题描述

有matlab函数可以执行以下操作吗?

Is there a matlab function which allows me to do the following operation?

x = [1 2 2 3];

，然后基于 x ，我想构建矩阵 m = [1 2 2 3;1 2 2 3;1 2 2 3;1 2 2 3]

and then based on x I want to build the matrix m = [1 2 2 3; 1 2 2 3; 1 2 2 3; 1 2 2 3]

推荐答案

您正在寻找 REPMAT 函数:

x = [1 2 2 3];
m = repmat(x,4,1);

您还可以使用索引来重复行:

You can also use indexing to repeat the rows:

m = x(ones(4,1),:);

甚至是外部产品:

m = ones(4,1)*x;

，也使用BSXFUN:

and also using BSXFUN:

m = bsxfun(@times, x, ones(4,1))

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