Create vector with predetermined number of certain elements
显示 更早的评论
Hi everyone,
I have a problem where I have a set of numbers, eg; [3 5 9] and for each of these numbers an amount of occurences eg. [2 1 5]. Now i would like to create a vector containing these numbers the prespecified amount of times, so for the example the result would be [3 3 5 9 9 9 9 9 ]. Is there an elegant way to do this in MATLAB, that is, vectorized?
Thanks in advance for your input.
采纳的回答
Star Strider
2016-3-27
Use the repelem funciton:
V = [3 5 9];
N = [2 1 5];
Out = repelem(V, N)
Out =
3 3 5 9 9 9 9 9
2 个评论
Star Strider
2016-3-27
My pleasure!
更多回答（1 个）
Image Analyst
2016-3-27
Here's one straightforward, easy-to-understand way that's pretty fast.
numbers = [3 5 9];
occurrences = [2 1 5];
output = zeros(1, sum(occurrences));
index1 = 1;
for k = 1 : length(numbers)
index2 = index1 + occurrences(k) - 1;
output(index1:index2) = numbers(k)
index1 = index2 + 1;
end
类别
在 帮助中心 和 File Exchange 中查找有关 Performance and Memory 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 
