MATLAB and sampling rate I have a question about sammpling rate in MATLAB. 
I read a .wav file using audioread(). It give me sampled data called my_data, and $88.2 \textrm{ kHz}$ as a samping rate, called Fs.

When I played this data with audioplayer(my_data, Fs), it works well and totally right sounds with original file.

What I tried to do is getting odd-indexed data like this :

my_data = [1 2 3 4 5 6 7 8 9 10]
my_odd_data = [1 3 5 7 9]


I thought that this procedure is like sampling my_data with half of Fs, but it is not true. I want to know why this procedure is not sampling with Fs/2.
As people have said in the comments, to have it sound right you will need to low pass filter before subsampling.

The matlab function decimate does this automatically and gives some control over the type of low pass filter used.