To convert Simulink models or MATLAB code to C, you need a Real-time Workshop . It supports only a subset of the MATLAB language and is focused on embedded systems.
See also other MatWorks products for code generation and application deployment:
http://www.mathworks.com/products
MATLAB Compiler C, , (dll), MATLAB, MATLAB Compiler Runtime (MCR). , , MATLAB.
2011a. MathWorks : MATLAB Coder, Simulink Coder Embedded Coder.