creating a matrix of instances in verilog-A

Hello

I am trying to create a matrix of instances but not successfully so far. It is composed by 120 rows and 160 columns. I have to separate it in row/column even and odd. So I have 60 even and odd rows and 80 even and odd columns. I am trying to use  two for construction to instantiate the devices  between the rows and columns but I am facing some difficulties. I have to name the instances, and I tried to do it using a variable but does not work. It thinks that i am trying to use a function. The instance is a photodiode and I am nameing them by d_odd and d_even. Could you help me on that ? thanks

`include "constants.vams"
`include "disciplines.vams"
`include "photodiode.va"
module fpa_120_160(col_even, col_odd, row_even, row_odd);

inout [1:80] col_even;
electrical [1:80] col_even;
inout [1:80] col_odd;
electrical [1:80] col_odd;
inout [1:60] row_even;
electrical [1:60] row_even;
inout [1:60] row_odd;
electrical [1:60] row_odd;

genvar a,b;
integer c,d,k;

real i ;

analog begin
    
    @(initial_step)     begin
        
                                       k = 0;
                                       c = 1;
                                       d = 1;
                              end            
    
    for (a = 1 ; a <= 60 ; a = a + 1 )
        
        i = 0 + 1.666*k;
        
        begin
        
            for (b = 1 ; b <= 80 ; b = b + 1 )
            
                d_odd(c) (col_odd[b] row_odd[a]) photodiode intensity = i;

                c = c + 1;
            
                d_odd(c) (col_even[b] row_odd[a]) photodiode intensity = i;

                c = c + 1;
                
                
                d_even(d) (col_odd[b] row_even[a]) photodiode intensity = i;

                d = d + 1;
            
                d_even(d) (col_even[b] row_even[a]) photodiode intensity = i;
                
                d = d + 1;
        end
                
        k = k + 1;
        
    end        
                
endmodule