清空筛选条件
清空筛选条件

How to avoid for-loop here; repmat

2 次查看（过去 30 天）
Pete sherer
Pete sherer 2018-9-17
评论： Star Strider 2018-9-17
Hi Could anyone help suggest a faster way to construct this vector?
xval = [1 2 7 9];
numX = [1 4 2 3];
% I want final output to be [1 2 2 2 2 7 7 9 9 9];
fullX = [];
for runi=1:length( xval)
tval = xval( runi);
n = numX( runi);
if n > 0
fullX= [ fullX; repmat( tval, n, 1)];
end
end %

请先登录，再回答此问题。

采纳的回答

Star Strider
Star Strider 2018-9-17
If you have R2015a or later, use the repelem (link) function:
fullX = repelem(xval, numX)

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Creating and Concatenating Matrices 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