more questions regarding modelsim and matlab simulink

[vivo_m]

hello everybody..


i'm trying to make feedback from modelsim to simulink component and to pass the value to my modelsim component irrespective to time (with respect to a non-time variable).. So I used an embedded matlab function component from simulink that works based upon input flag coming from modelsim component.. at this point i 've alot of errors

* there is a variable that is passed from workspace to the embedded component, it carries a string representing the video name.. to do so it should be timed and to avoid that i defined it as a global variable but it does'nt work also..

* also i'm not able to use either aviinfo() or mmreader() within embeded component

* within embeded component i'm randomizing a value using randint() to avoid being absolete i used randi
i got this error "Function 'randi' implicitly resolved in the MATLAB workspace. Implicit evaluation in MATLAB is not supported. Please declare this function extrinsic using eml.extrinsic('randi'), or call it using feval."

* beside that i'm having these errors
-->Coder Error: Errors occurred during parsing of Embedded MATLAB function 'Embedded MATLAB
-->InterfaceError :Embedded MATLAB Interface Error: Errors occurred during parsing of Embedded MATLAB function 'Embedded MATLAB

* plus this warning
-->Chart Embedded
MATLAB Function #18 has signals with underspecified type, size, and/or complexity.

* ONE MORE QUESTION plzz
for any used variable within this block should i define it as persistant first or what
as whenever i use a variable e.g. x_col = abs(round(x-(p_w/2))); got an error message asking me to declare it first

any help plzzzz

thanks