Colon syntax for creating a sequence of numbers that skips a given number?
13 次查看(过去 30 天)
显示 更早的评论
I may be going crazy, but I remember both reading about and using a part of colon notation for creating a sequence of numbers (say 1:10 giving 1 2 3 4 5 6 7 8 9 10) but skipping a given number.
For instance, if I wanted 1:10 but to skip the number 5, it would yield 1 2 3 4 6 7 8 9 10.
I thought it was something like 1:~5:10, but that is certainly not the notation.
I know that
number = 5;
sequnce = [1:number-1 number+1:10];
would yield the same thing, but I distinctly remember a cleaner notation for it. I have been entirely unsuccessful in finding anything about it online. Does it actually exist, or is my memory making things up?
0 个评论
回答(1 个)
John D'Errico
2023-3-18
编辑:John D'Errico
2023-3-18
You can't, at least not directly. But it is quite simple. For example:
setdiff(1:10,3) % 1:10, missing 3
There are probably other solutions too, as there always are, but I prefer this one. It is easy to understand, and easy to write.
The notation you remember is not anything in MATLAB, at least not currently. It may have been something in another language you recall.
2 个评论
Walter Roberson
2023-3-19
Note that you may have to use the 'stable' option of setdiff.
setdiff(10:-1:1,3)
setdiff(10:-1:1,3,'stable')
John D'Errico
2023-3-19
Good point about the 'stable' option, necessary if you want to leave the order unchanged in a decreasing sequence.
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Startup and Shutdown 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!