what exactly this Logical indexing refering to?

I tried this example

C = {'one', 'two', 'three'; 1, 2, 3}

when i do those commands

>> x=logical([0;0]);
nums = [C{x,:}]

The output is: nums =[]

similarly when

>> x=logical([0;1]);
nums = [C{x,:}

The o/p is: 1 2 3

>> x=logical([1;0]);
nums = [C{x,:}]

The o/p is: nums= onetwothree

>> x=logical([1;1]);
>> nums = [C{x,:}]

The o/p is: nums= onetwothree

what i want to know, what exactly does this function nums = [C{x,:}]do to return this values.

I knew that if i put x=scalar value, it will return the row if this scalar number.

but in my case, i don't know what this function nums = [C{x,:}]do that it returned the values illustrated above.

Answer 1

[Fangjun Jiang]

Please look at the "Using Logicals in Array Indexing" part of this "Matrix Indexing"

web(fullfile(docroot, 'matlab/math/matrix-indexing.html'))

Answer 2

[Thorsten]

When you ask for [C{logical([1 1]),:}] which is the same as [C{:,:}] you ask Matlab to combine variables of unlike classes, namely double and char. In this case Matlab converts the resulting array to char, as detailed in http://de.mathworks.com/help/matlab/matlab_prog/valid-combinations-of-unlike-classes.html

char(2) and char(3) result in a space on my machine, you the result you get is

onetwo three