How to determine sign properties (++, +-, --) of sum block using matlab coding

I have two sum blocks, one with sign (++) and other with (+-). Will help of matlab coding, how will I be able to extract these properties. Appreciate all the help.

Answer 1

[Jon]

Suppose your Simulink model is called myModel, and the sum blocks are named Sum1 and Sum2.

You can get the signs, for example for Sum1 using:

signs = get_param('myModel/Sum1','Inputs');

You can set the signs using

set_param('myModel/Sum1','Inputs','|+-')