how to extract all values in array after certain value?

Question

nines 2022-6-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1742540-how-to-extract-all-values-in-array-after-certain-value

评论： nines 2022-6-17

采纳的回答： Karim

在 MATLAB Online 中打开

Hello!

I have an array where I am trying to extract all of the array between a set of numbers that are in the third column.

I have an array:

I want to extract:

I have tried:

third_row = array(:,3)==5000;
if third_row==5000;
    find(array>third_row)
end

But I keep getting:

Do you have any suggestions?

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

Karim 2022-6-17

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1742540-how-to-extract-all-values-in-array-after-certain-value#answer_987625

在 MATLAB Online 中打开

Hi,

Assuming that the part you need is between two random number, you can try the following:

Data = [1 0 0
    2 0 0
    3 0 0
    4 0 5000
    5 0 0
    6 0 0
    7 0 0
    8 0 5003];
NonZero = find( Data(:,3) ~= 0 ); % get non-zero values
ExtractedData = Data( NonZero(1) : NonZero(2), :)
ExtractedData = 5×3
           4           0        5000
           5           0           0
           6           0           0
           7           0           0
           8           0        5003

Otherwise if you need the values between two specific values, you can try the following:

StartIdx = find( Data(:,3) == 5000 );
StopIdx = find( Data(:,3) == 5003 );
ExtractedData = Data( StartIdx : StopIdx, :)
ExtractedData = 5×3
           4           0        5000
           5           0           0
           6           0           0
           7           0           0
           8           0        5003

Hope it helps