How to select rows that precede and follow a specific row with a certain value?

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Steve Schulz 2021-11-16

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评论： Steve Schulz 2021-11-16

Hey there,

I'm currently working with experimental data that is stored in a 288 x 25 double (288 = total number of trials ; 25 = variables of interest). Column '13' represents the 'correctness' coded as 1 = correct and 0 = error. What I'm trying to do is to select sequences of '1 0 1' that is every row that precedes an error trial and every row that follows the same error trial. I want to store the 'pre-error-trials' and the 'post-error-trials' as variables separately.

Since I'm still a newbie to Matlab I'm not familiar with every concept but I guess that logcial indexing might play a role here?

I would be very grateful if you could provide some help.

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Matt J 2021-11-16

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c=data(:,13);
 preError=data( c(1:end-1)==1 & c(2:end)==0 ,:);
postError=data( c(1:end-1)==0 & c(2:end)==1 ,:);

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Matt J 2021-11-16

Oh, it seems that you are familiar with this?

No, but clearly if the column data(:,13) begins or ends with a 0, it will happen.

Steve Schulz 2021-11-16

Ah, I got it. Thanks !

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MATLAB Language Fundamentals Matrices and Arrays Matrix Indexing

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