How to change audio output device

I want to be able to specify which audio output the sound to be played. Using audioDeviceWriter I am able to get the device info, but I don't know how I can change the output to a specific device. I try .Device(index) but that doesn't work. Please help.

fs = 44100;
T = 1/fs;
t = [0:T:2];

f1 = 250;
omega1 = 2*pi*f1;

phi = 2*pi *0.75;
x1 = cos(omega1*t +phi);

deviceWriter = audioDeviceWriter(fs);
devices = getAudioDevices(deviceWriter);
% I wish to change the audio device here between built-in and my sound card.
deviceWriter.Device(3)

sound(0.9*x1, fs)

Answer 1

[Auralius Manurung]

deviceWriter is more complex to use as it plays only one frame. It means you have to use it in a loop. You also don't need the code in the last line. Rather then using deviceWriter, why not using audioPlayer?

fs = 44100;
T = 1/fs;
t = [0:T:1];

f1 = 250;
omega1 = 2*pi*f1;

phi = 2*pi *0.75;
x1 = cos(omega1*t +phi)';

info = audiodevinfo
player = audioplayer(0.9*x1, fs, 16, 3);
play(player);

You can explore the info.output variable to see the list of detected hardware.

References: https://www.mathworks.com/help/matlab/ref/audioplayer.html