create vector of repeating elements (sort of)
显示 更早的评论
How can I easily create a vector such that:
w = 3
n = 8
v = (1 w times) (2 w times) (3 w times) ... (n w times)
so i would have:
v = [1 1 1 2 2 2 3 3 3 4 4 4 .... 8 8 8]
采纳的回答
更多回答（4 个）
Lucas García
2011-9-20
One of many ways:
>> w = 3; n = 8;
>> v = repmat(1:n,w,1);
>> v = v(1:end)
Oleg Komarov
2011-9-20
rude(len,val)
Richard Tyson
2013-8-15
1 个投票
If you need it to be fast you should avoid using repmat. Stick to C functions which don't need to parse input arguments and do one specific task:
n = 8;
w = 3;
v = ceil( [1:(w*n)]./w )
If anyone has a faster way please post. I do this kind of operation a lot.
2 个评论
the cyclist
2013-8-15
This thread is nearly two years old. You might want to post this as a new question.
Artur Palha
2014-9-25
n = 8; w = 3; v = rectpulse(1:n)
This is the fastest option I know of.
Wayne King
2011-9-20
One way:
w = 3;
x = 1:8;
x = arrayfun(@(x) repmat(x,1,w),x,'UniformOutput',false);
x = cell2mat(x);
Wayne
1 个评论
Jan
2011-9-20
ARRAYFUN and CELL2MAT needs a lot of time. Using REPMAT directly is much faster.
类别
在 帮助中心 和 File Exchange 中查找有关 Creating and Concatenating Matrices 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
