ERROR: Dimension _ is fixed on the left-hand side but varies on the right. How to solve this?

Question

Dani Tormo 2013-6-18

Hi!

I am using an embedded Matlab function inside a subsystem mask in Simulink, which is taking from a mask the size of a vector inside the m-function.

I want this signal to has its size fixed for the whole simulation, so I unchecked the tunable checkbox on the mask.

However, when I use this parameter to define the size of the variable I get this error:

 Dimension 2 is fixed on the left-hand side but varies on the right ([3 x 6] ~= [3 x :?]).

If I use a number instead, the simulation works.

How can I use a mask parameter to fix the size of the vector without getting this error?

Many thanks!

Answer 1

Kaustubha Govind 2013-6-18

Could you also ensure that the parameter "Tunable" checkbox is unchecked on the MATLAB Function block's Ports and Data Manager.

Dani Tormo 2013-6-18

编辑：Dani Tormo 2013-6-19

Ahaa! There was another tunable parameter!

Yeah, unchecking this one it is working. But what's the difference between them? Why there are two tunable parameters?

Thanks Kaustubha!