How To Send Data From The Arduino To MATLAB

Using Arduino Interfacing w/ Software on the Computer
1

I am trying to establish this connection using the same code in the link
How To Send Data From The Arduino To MATLAB

but when I run the Matlab I get this error

Error using serial/fopen (line 72)
Open failed: Port: COM4 is not available. No ports are available.
Use INSTRFIND to determine if other instrument objects are connected to the requested device.

Please any body has an idea why I am getting this error???

2

sorry
this is the link

3

Isn't it obvious that you are using the wrong serial port in MATLAB?

Use the same port that you use to program the Arduino.

4

Have you tried using the Support package to send information from Arduino to MATLAB? http://www.mathworks.com/hardware-support/arduino-matlab.html