How to use logical indexing for a column of 0 and 1
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Hello! I am stil learning the basics of matlab and am having trouble with logical indexing. Each excel sheet has the same number of columns yet vary by number of rows. I want to take column "data(:,end-6)" which has a column of 0 and 1 and take all the rows that have the number 1 and create a new array and do more math calculations, using only the rows with a number 1 in that column. Any help would be appreciated. Thank you.
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Cris LaPierre
2021 年 9 月 28 日
編集済み: Cris LaPierre
2021 年 9 月 28 日
A simple example:
x = (1:10)';
% extract rows where x>5
ind = x>5
x(ind)
% or just simply
x(x>5)
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Cris LaPierre
2021 年 9 月 28 日
ind returns a logical for every element, indicating whether it meets the criteria or not. When used as an index, only true values are extracted. The challenge perhaps with your data set is that the extracted data is also 1, so it may be hard to discern between the logical array and the actual values.
Also, if your values are exactly 1, you can use ind = D==1;
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