extract rows of a matrix

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RuiQi
RuiQi 2016-7-19
回答： Star Strider 2016-7-19
I have a matrix with many rows and 6 columns. I want to extract the rows whose 6th column == 1. How can I do this ? And what is this 'technique' called ? Logical indexing ? Find ? I keep forgetting how to do this. I need to refer to the documentation but im not sure what to google.

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Stephen23
Stephen23 2016-7-19
编辑：Stephen23 2016-7-19

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Star Strider
Star Strider 2016-7-19
This works:
M = randi(9, 20, 6);
M_extract = M(M(:,6) ==1, :);

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