清空筛选条件
清空筛选条件

Preallocating the size of a matrix which concatenates horizontally matrices in a for loop

1 次查看（过去 30 天）
Giorgos Papakonstantinou
How can I preallocate matrix t:
t=[];
for i=1:3;
a=randi(10,3,2);
t=[a t];
end

请先登录，再回答此问题。

采纳的回答

the cyclist
the cyclist 2013-6-16
Like this. (I also parameterized so it would be easier to see how this generalizes.)
m=3;
n=2;
t = zeros(m,m*n);
for i=1:m;
a = randi(10,m,n);
t(:,n*(i-1)+1:n*i) = a;
end
You don't need the intermediate variable, either:
m=3;
n=2;
t = zeros(m,m*n);
for i=1:m;
t(:,n*(i-1)+1:n*i) = randi(10,m,n);
end

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Loops and Conditional Statements 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by