How to include values starting from the nth instance of a value?

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lil brain 2022-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/1671739-how-to-include-values-starting-from-the-nth-instance-of-a-value

评论： Voss 2022-3-15

采纳的回答： Voss

data_in.mat

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Hi,

I have a data set where column 4 indicates a type of event. Columns 7-27 in this same data set are the raw data I am working with. I want to write two pieces of code where I first, include all the raw data (columns 7-27) until the a certain event occurs for the first time (column 4), and second, include all the raw data (columns 7-27) after the event occurs for the last time (column 4).

What I have:

Here I want to include all the raw data from the lines where column 4 equals "Basket Glitch".

baskets_data_participant = data_in(data_in(:,4) == "Basket Glitch", 7:end);

What I need:

1) I want to change the above code to include all the raw data up to the first instance of "Basket Glitch".

2) I want to change the above code to include all the raw data after the last instance of "Basket Glitch"

How would I go about doing that?

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Voss 2022-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/1671739-how-to-include-values-starting-from-the-nth-instance-of-a-value#answer_917689

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bg_idx = find(strcmp(data_in(:,4),'Basket Glitch'));
% include all the raw data up to the first instance of "Basket Glitch":
data_out = data_in(1:bg_idx(1),7:end);
% include all the raw data after the last instance of "Basket Glitch":
data_out = data_in(bg_idx(end)+1:end,7:end);