How do i use and index an array in an "else-if" expression in Simulink?

I have a Matrix of Values that i want to use in an "else-if" expression of an If-Block

Is it only possible to index a list e.g. L(1) but not an matrix e.g. L(1,1) in this scenario? Because Simulink sees the comma as the start of the next expression.

% Possible
u1>=L_R(1) & u1<L_R(2), 

% Not Possible
u1>=L_R(1,1) & u1<L_R(2,1),

Error: "The expression u1 >= L(2" has a syntax error

Does anyone have an idea for a Workaround?

Answer 1

[Benjamin Thompson]

What is L_R? I do not think the if subsystem block in Simulink allows any symbols other than uN, where N is between 1 and the number of inputs you put in the block mask. If L_R is like a model workspace parameter or something like that, can you just add a second input to the if block (or more than 1) and let the block handle all of them as uN, replacing all L_R references with ua, ub, uc, etc. The block probably won't accept a matrix as an input.

[Benjamin Thompson]

Use a constant block to access L_R(1,1) and pass it to the input of an if block.

[S.L.]

L_R is a matrix saved in the workspace.

The idea with the constant Block is great. It works just fine, a pitty that it doesnt look that clean when you have a lot of inputs.

My workaround was to use linear indexing, which also worked, but had its toll on the code performance! So i am going to use your solution.