Simulink and Variable Sized Global Variables

I have a M-Function which reads some data at each time step, stores it in a growing dictionary (A = [A; a], where 'a' is the new data) and then uses it to produce an output.

I would like to use this function in Simulink, however I cannot see a way to create a variable sized global variable that A needs to be.

Could someone please point me in the correct direction?

Answer 1

[C.J. Harris]

I don't believe you can do this, at least not in an easy way. You might be better off looking into the possiblity of initialising A to its maximum size, and then selecting the part of the vector you need to use at each timestep.

Answer 2

[Guy Rouleau]

Simulink supports variable size signals. However you need to specify a maximum size.

This topic is covered here:

http://www.mathworks.com/help/toolbox/simulink/ug/br4lzsy.html

If you want, you can use variable size also in the MATLAB Function block:

http://www.mathworks.com/help/toolbox/simulink/ug/br9_55w.html

[Superfish]

Yeah, but it doesn't seem to work for global variables as it looks like data stores can't store variable data.