Matlab to s-function level2

Let say this is my algorithm in s-function level2

function Update(block

    meas = block.InputPort(1).Data; %%equivalent to meas(:,i+1) in matlab

    xhat = block.Dwork(1).Data;  %%equivalent to xhat(:,i+1) in matlab

now i want to use data which is equivalent to Matlab as ['meas(:,i)' and 'xhat(:,i)']. where should i find this data in sfunction level2? or how should i store this in s-fumction level2?

Thnak you.

[Kaustubha Govind]

Your question is not clear. Do you mean that you expect your input and dwork data to come in as 2-D arrays, but find that they are not?