有没有一个Matlab函数可以让我执行以下操作?
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]
。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:m = x(ones(4,1),:);
甚至可以使用外积:
m = ones(4,1)*x;
同时还使用了BSXFUN:
m = bsxfun(@times, x, ones(4,1))
vertcat
,像这样:x = [1 2 2 3];
m = vertcat(x,x,x,x);
x = [1 2 2 3];
m = [x;x;x;x];
编辑:
对于x的倍数,您可以这样做:
x = [1 2 2 3];
m = [x;2*x;3*x]; % [1 2 2 3; 2 4 4 6; 3 6 6 9]
编辑2:
对于m中任意数量的x...
n = 3; % number of repetitions...
x = [1 2 2 3];
m = [];
for i=1:n
m = [m;x];
end
m = [1 2 2 3; 2 4 4 6; 3 6 6 9]
,该怎么做? - Simonm = bsxfun(@times, x, (1:3)')
- Amro