How to use sparse in a matlab function block in simulink?

Hey, any suggestions on how i can use the sparse function in simulink?

Example:

function y = fcn(u)

      s = sparse(u)

y = full(u)

Error:

Undefined function or variable 'sparse'.

Is there any workaround like writing a new sparse.m or sending the variables to workspace and back to use sparse?

Thanks for your help!

Answer 1

[Wilmer Salto]

hi, i would like to know if you could use "sparse" in mulink ? i need a help

Answer 2

[Walter Roberson]

Simulink does not support sparse as a signal attribute, so you can only use sparse within a MATLAB function (or Level II S function), and would have to convert any results back to full before allowing them to be output.

In order to use sparse inside of a MATLAB Function Block, you need to

   coder.extrinsic('sparse');

Note that this will only work when Rapid Acceleration mode is turned off or is 'Normal'; for any higher level of acceleration, the internal code generation routines do not support sparse