How to use a matlab code in simulink block?

I am a beginner in simulink. I have my code written in matlab which is to be interface wih the simulink code. How do I use the same matlab code to use with simulink block? Please explain.

Answer 1

[Ilham Hardy]

Check this out:

http://www.mathworks.nl/help/simulink/slref/matlabfunction.html

Answer 2

[Sachin Ganjare]

Use Matlab function block from simulink library.

Answer 3

[Azzi Abdelmalek]

You can use Interpreted MATLAB Function. When you need to generate a C/C++ code, use a Matlab function like suggested by Ilham.