How to perform an find operation for multidimensional array in Simulink

Hello everyone, I am working with multidimensional lookup tables and I am a bit stuck with an equivalent of find function in MATLAB. I need the index k and I can feed this index to my multidimensional lookup tables to load the kth lookup table and kth breakpoint. However to find the kth index, I need to compare two signal values with an array of variables. for example if the signal goes

*signal = [1 1 1 1 1 2 2 2 3],*

I need to compare it with a constant matrix which goes

 *mymat =  [ 1 1 2 3;
            2 3 3 4].*

The signal is time dependant naturally, and the matrix is constant. the matrix records certain changes in values like 1to2, 2-3, 1-3, 3-4, 3-2,2-1 etc.

So basically I need to see where my signal changes from 1 to 2 and then I need to compare it with the matrix and see where I have the values [1;2]. ( should be index 1). The problem is two fold.

first I do not know how I can load the constant matrix in simulink. the from workspace option will not work and neither will the constant block option

Secondly, I tried using the prelookup table. I designated the two signal values as signal before and signal after ( using a memory block) and fed them individually to a pre look up table block. However here the breakpoint should be monotonically increasing and as it is seen, the individual rows of variables are not monotonically increasing.

I am struggling with this problem for a while now and would appreciate any suggestion. Is there any workaround solution to this issue?