Selecting data in an array based on a logical value array?

Hello all.

I've recently found code that looked strange to me. See the below (this example is from MATLAB help for table).

The dark orange boxes show that data in a numeric array variable (here, it is 'T.BMI') can be directly selected by a logical value array. It seems useful to select a specific data withtout using a loop (so the calculation speed would be increased), but I don't know how this way of accessing data in a array is possible or works. Could you provide logical explanation of it?

Answer 1

[Stephan]

https://de.mathworks.com/help/matlab/math/array-indexing.html#MatrixIndexingExample-3