How can I select a part of an array between NaN values

Question

Joanie 2014-6-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/133708-how-can-i-select-a-part-of-an-array-between-nan-values

回答： Andrei Bobrov 2014-6-11

For example I have an array like this:

T = [NaN NaN; 1 3; 2 4; 5 6; 8 7; NaN NaN; NaN NaN; 4 5; 6 7; NaN NaN; NaN NaN; 1 2; 2 4; 5 6; NaN NaN; NaN NaN; 1 3; 5 6; 8 8; NaN NaN; NaN NaN; 5 3; 6 7; NaN NaN];

now I like to have a code were the user can select a part of this array by typing the number of the part. Number 1 starts after the first NaN NaN and ends with the second NaN:

part1 = [1 3; 2 4; 5 6; 8 7];

number 2 starts after the third NaN NaN and ends for the fourth NaN NaN:

part2 = [4 5; 6 7];

enc. (in this example there are 5 numbers you can select).

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Answer 1

Andrei Bobrov 2014-6-11

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/133708-how-can-i-select-a-part-of-an-array-between-nan-values#answer_140418

在 MATLAB Online 中打开

l = ~isnan(T(:,1));
k = [l(1);diff(l)] == 1;
ii = cumsum(k);
z = (1:size(T,1))';
outc = accumarray(ii(l),z(l),[],@(x){T(x,:)});
N = 2; % the number of the part
out = outc{N};