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Let say if I have this data
my_data = [ 10 20 30 40; 0.1 0.7 0.4 0.3; 6 1 2 3; 2 5 4 2];
my_index = logical(my_data(4,:)==2);
What is the simplest way to use ‘my_index’ to give this output
10.0000 40.0000
0.1000 0.3000
6.0000 3.0000
2.0000 2.0000
but I’m suspicious that this is so simple that it doesn’t satisfy your (background) requirements …