Piece-wise linspace
显示 更早的评论
Hi
I need to generate a vector (0's and 1's), when I'm given indices for the starting and endpoints of the 1's trains.
Example: m=zeros(1,10); starts=[1 5 9]; ends=[3 6 9];
the generated vector should be [1 1 1 0 1 1 0 0 1 0]
Any way of avoiding a loop? [starts(:):ends(:)] only looks at the first entry of the source vectors...
thanks Tozé
采纳的回答
Jan
2012-1-30
Do the sections overlap? If not, try this:
m = zeros(1, 10);
starts = [1 5 9];
ends = [3 6 9];
m(starts) = 1;
m(ends) = -1;
m = cumsum(m);
If they sections are overlapping:
m = zeros(1, 10);
p = zeros(1, 10);
starts = [1 5 9];
ends = [3 6 9];
m(starts) = 1;
m(ends) = -1;
m = cumsum(m);
p(m > 0) = 1;
I cannot test this currently, so please keep care.
更多回答（3 个）
Bjorn Gustavsson
2012-1-30
0 个投票
Why bother searching for a cunning loop-free version (non-explicit) when the looped version is so straightforward? How much time does it take to come up with something clever compared to the potential gain in run-time?
HTH,
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 
