conversion of matlab code to C language program to run in nios2..how.?

Hii,

i have hdl coder in matlab v2011.

when a matlab file is converted into C language file then its giving errors.

what is the procedure to generate C program successfully in nios after converting from matlab code.

can anyone help me in converting a matlab code to C/C++ code so that i could be generated on nios2 and compiled on altera de1 board.

thanks.

regards.