清空筛选条件
清空筛选条件

Creating matrix outside for loop

1 次查看（过去 30 天）
m13
m13 2017-2-19
评论： Star Strider 2017-2-20
I need to create a matrix of variables and have the current code below. Is there anyway to do this without a for loop?
x = 0:.1:1;
y = 0:.1:1;
for i = 1:length(x)
for j = 1:length(y)
x2(i,j) = x(i);
y2(i,j) = y(j);
end
end

请先登录，再回答此问题。

采纳的回答

Star Strider
Star Strider 2017-2-19
编辑：Star Strider 2017-2-19
Try this:
x2 = y'*ones(size(x));
y2 = ones(size(y'))*x;
EDIT —
The R2016b multiplication automatically does the expansion. Previous versions would require bsxfun calls:
x2 = bsxfun(@times, y', ones(size(x)));
y2 = bsxfun(@times, ones(size(y')), x);
  5 个评论
显示 3更早的评论
m13
m13 2017-2-20
Star if I need to use the y1 value in another for loop does this still work? I tried it and now I'm getting the error that the number of elements must be the same. The for loop is:
for k = 1:n
U(k) = sin(y1);
end
Star Strider
Star Strider 2017-2-20
You do not need the loop.
This works:
U = sin(y1);
(I apologise for the delay.)

请先登录，再进行评论。

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