how can store "mxarray indeces into non-mxarray indeces temporarily"

hai...., when i'm trying to use "coder.intrinsic('function name')" in "matlab function block" in similink

i'm getting error as "mxArray indices are not supported. You can obtain this functionality by first storing the index expression into a non-mxarray temporary"

the output of the function defined as coder.extrinsic, i'm getting a class of "MATLAB type" which is not accepting by the "matlab function block"

please help me with this, thanks alot for any help i got.