How can I extract values from a vector element that includes NaN elements?

Question

Jose Valles 2018-1-8

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/376135-how-can-i-extract-values-from-a-vector-element-that-includes-nan-elements

评论： Guillaume 2018-1-8

采纳的回答： Guillaume

Hi, Let's suppose that we have the following vector

V = [3 4 5 NaN NaN NaN 10 NaN 15 45 95 32 65 NaN NaN]

I would like to extract the numerical values and create new variables from those values.

V1 = [3 4 5]

V2 = [10]

V3 = [15 45 95 32 65]

I think is important to mention that the number of new variables (V1,V2 and V3) should be based on the number of "events" encounter in the vector. In this case 3 "events".

Also, the first vector value can be a number or NaN element

Regards

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Guillaume 2018-1-8

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/376135-how-can-i-extract-values-from-a-vector-element-that-includes-nan-elements#answer_299162

在 MATLAB Online 中打开

Note that creating numbered variables is an extremely bad idea (search the forum or faq to know why). We'll be creating a cell array that can easily be indexed instead.

Assuming that V does not start by NaN:

V = [3 4 5 NaN NaN NaN 10 NaN 15 45 95 32 65 NaN NaN];  %demo data
grouplength = diff([0 find(diff(isnan(V))) numel(V)]);  %find length of non-nan and nan runs
Vgrouped = mat2cell(V, 1, grouplength);   %split according to runs
Vgrouped = Vgrouped(1:2:end)   %get rid of nan runs, assumes that 1st run is not nan