how to call a time dependent function in matlab in another time dependent function

I just want to call a function in another function. I am getting an error i dont get what is wrong in that.if any one can help it will be nice.

[per isakson]

I fail to reproduce any error

>> F= nonmnoise(); whos F
  Name      Size             Bytes  Class     Attributes
  F         1x100              800  double     

and

>> [t,x] = call1_dstate(); whos t x
Warning: Imaginary parts of complex X and/or Y arguments ignored 
> In call1_dstate (line 14) 
  Name        Size            Bytes  Class     Attributes
  t         437x1              3496  double              
  x         437x4             27968  double    complex   

The warning refers to

 plot(t,tr_rho2)

What error do you encounter?