runs of 1s and 2s in a long vector

1 次查看（过去 30 天）

Pappu Murthy 2018-7-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/412163-runs-of-1s-and-2s-in-a-long-vector

评论： Pappu Murthy 2018-7-26

i have a long vector which has a whole bunch of 1s and 2s.. I need to find how many such strings of 1s and 2s are there. Is there a slick way of getting this out of the array?

2 个评论
显示无隐藏无

Sushant Mahajan 2018-7-26

Do you need the total number of 1s and 2s? Or are you looking for the number of consecutive bunches (groups) of 1s/2s in that array?

jonas 2018-7-26

Please provide an example including your desired output.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Guillaume 2018-7-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/412163-runs-of-1s-and-2s-in-a-long-vector#answer_330400

编辑：Guillaume 2018-7-26

在 MATLAB Online 中打开

If you want to find the number of runs (regardless of their length) as opposed to the count of 1s or 2s:

v = [0 3 1 1 1 4 5 6 2 2 2 1 1 2 7 8 9 1 1 1 2 2 1 1 1 10 11 2 2 12 2];  %demo data
runcount = @(v, n) nnz(diff([false, v == n]) == 1);  %works only for row vectors
runsof1 = runcount(v, 1)
runsof2 = runcount(v, 2)