Why does Embedded MATLAB fail to detemrine the size of my expression in Simulink 7.2 (R2008b)?

I use the following MATLAB code in an Embedded MATLAB Function block:

function y = fcn(u)

y = eye(6);

y(1,u-1:u+1) = 2

I receive an error message similar to:

 Size of index expression is not statically known.

or

 Could not determine the size of this expression

Answer 1

[MathWorks Support Team]

This enhancement has been incorporated in Release 2011a (R2011a). For previous product releases, read below for any possible workarounds:

In this case, Embedded MATLAB does not recognize that the size of the expression is constant. To workaround this issue, define a vector of indices to be used in the assignment, as in this example:

function y = fcn(u)

y = eye(6); 

T = (0:2)+u-1;   % Define the vector of indices to be assigned

y(1,T) = 2;         % assign values in the large matrix