how i can select a part or section in the matrix

i have a matrix as shown in the file i need to select specific section in the matrix and then do on it my equation .

i have 8*8 bit matrix inside 16*16 bit matrix . I want when it reaches the number 8 it jumps or goes to 17 and when it completes to 24 and goes to 33 and at 33 it continues to 40 and at the 40 it leaves and goes to 49 and continues to 56 and so on until the matrix 8 * 8 is completed as shown in the attached file. please if any one . Please if anyone has an idea please help me and I would be grateful to him

Answer 1

[Voss]

Like this?

A = reshape(1:256,16,16).' % construct 16-by-16 matrix as in the file

A = 16×16

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160

% Take the 8-by-8 matrix that is the upper-left quarter of A
B = A(1:8,1:8)

B = 8×8

1 2 3 4 5 6 7 8 17 18 19 20 21 22 23 24 33 34 35 36 37 38 39 40 49 50 51 52 53 54 55 56 65 66 67 68 69 70 71 72 81 82 83 84 85 86 87 88 97 98 99 100 101 102 103 104 113 114 115 116 117 118 119 120

[Zeina Abdullah]

ok thank you very much @Benjamin

but now i have another problem in matlab can you help me to solve it

[Zeina Abdullah]

i have this code of matrix 24*24 and do on it selecter to select 8*8 matrix and 16*16 and finaly all matrix 24*24 . the problem each of these three matrix have a procedure . and i need to do general code to them and when we have (select=1) 8*8 only the part of 8*8 bit work . when we have (select=2) 16*16 only the part of 16*16 bit work. when we have (select=3) 24*24 only the part of 24*24 bit work.

%function const_interleaver(select)

%% constructing the orignal address matrix

Address=zeros(24); s

for i=1:24

for j=1:24

Address(i,j)=24*(i-1)+j;

end

end

%% chosing the matrix size

if select==1 % 8-bit

for i=1:8

for j=1:8

Address(i,j)=Address(i,j)-(i-1)*16

end

end

%%%%%% put your 8 bit interleaver structure here %%%%%%

elseif select==2 % 16-bit

for i=1:16

for j=1:16

Address(i,j)=Address(i,j)-(i-1)*8;

end

end

%%%%%% put your 16 bit interleaver structure here %%%%%%

else

%%%%%% put your 24 bit interleaver structure here %%%%%%

end

[Voss]

Does this do what you have in mind?

function const_interleaver(select)
N_bits = 8*select;
Address=zeros(N_bits);
for i=1:N_bits
    for j=1:N_bits
        Address(i,j)=N_bits*(i-1)+j;
    end
end

[Zeina Abdullah]

I don't know how to thank you in this way you made me understand another way to write code. But I mean that I have this code and it works in cases, and these cases have a common code between them. I need to make a general code, and by choosing one of the cases, part of it will work, for example, in the case of 8 * 8, the code will work to part 8, but if it is 16 * 16, it will work to part 16 * 16 And if it is 24 * 24, it will work to part 24, and I will write the general code for you in another comment so that you understand what I mean

[Zeina Abdullah]

%clear all

%clc

dim =24; % define square matrix dimention

x = [];

coun = 1;

for i=1:dim:(dim.^2-dim+1)

row = [i:i+dim-1];

x = [x;row];

end

Input_Index = x; % generate square matrix in order ascending index

% ==========================================

% Generate Chaotic interleaver Scheme

%==========================================

%-------------------(1)-------------------------

part1 = [];

for i =1:2

part1_i =x(dim:-1:dim/2 + 1,i)';

part1 = [part1 part1_i];

end

part1;

%-------------------(2)-------------------------

part2 = [];

for i =1:2

part2_i =x(dim/2:-1:1,i)';

part2 = [part2 part2_i];

end

part2;

%-------------------(3)-------------------------

part3 = [];

for i =3:4

part3_i =x(dim:-1:dim/2 + 1,i)';

part3 = [part3 part3_i];

end

part3;

%-------------------(4)-------------------------

part4 = [];

for i =3:4

part4_i =x(dim/2:-1:1,i)';

part4 = [part4 part4_i];

end

part4;

%-------------------(5)-------------------------

part5 = [];

for i =5:6

part5_i =x(dim:-1:dim/2 + 1,i)';

part5 = [part5 part5_i];

end

part5;

%-------------------(6)-------------------------

part6 = [];

for i =5:6

part6_i =x(dim/2:-1:1,i)';

part6 = [part6 part6_i];

end

part6;

%-------------------(7)-------------------------

part7 = [];

for i =7:8

part7_i =x(dim:-1:dim/2 + 1,i)';

part7 = [part7 part7_i];

end

part7;

%-------------------(8)-------------------------

part8 = [];

for i =7:8

part8_i =x(dim/2:-1:1,i)';

part8 = [part8 part8_i];

end

part8;

%-------------------(9)-------------------------

part9 = [];

for i =9:12

part9_i =x(dim:-1:dim/2 + dim/4+1,i)';

part9= [part9 part9_i];

end

part9;

%-------------------(10)-------------------------

part10 = [];

for i =9:12

part10_i =x(dim/2+dim/4:-1:dim/2+1 ,i)';

part10= [part10 part10_i];

end

part10;

%-------------------(11)-------------------------

part11= [];

for i =9:12

part11_i =x(dim/2:-1:dim/4+1 ,i)';

part11= [part11 part11_i];

end

part11;

%-------------------(12)-------------------------

part12= [];

for i =9:12

part12_i =x(dim/4:-1:1 ,i)';

part12= [part12 part12_i];

end

part12;

%-------------------(13)-------------------------

part13 = [];

for i =13:16

part13_i =x(dim:-1:dim/2 + dim/4+1,i)';

part13= [part13 part13_i];

end

part13;

%-------------------(14)-------------------------

part14= [];

for i =13:16

part14_i =x(dim/2+dim/4:-1:dim/2+1 ,i)';

part14= [part14 part14_i];

end

part14;

%-------------------(15)-------------------------

part15= [];

for i =13:16

part15_i =x(dim/2:-1:dim/4+1 ,i)';

part15= [part15 part15_i];

end

part15;

%-------------------(16)-------------------------

part16= [];

for i =13:16

part16_i =x(dim/4:-1:1 ,i)';

part16= [part16 part16_i];

end

part16;

%-------------------(17)-------------------------

part17 = [];

for i =17:20

part17_i =x(dim:-1:dim/2 + dim/4+1,i)';

part17= [part17 part17_i];

end

part17;

%-------------------(18)-------------------------

part18= [];

for i =17:20

part18_i =x(dim/2+dim/4:-1:dim/2+1 ,i)';

part18= [part18 part18_i];

end

part18;

%-------------------(19)-------------------------

part19= [];

for i =17:20

part19_i =x(dim/2:-1:dim/4+1 ,i)';

part19= [part19 part19_i];

end

part19;

%-------------------(20)-------------------------

part20= [];

for i =17:20

part20_i =x(dim/4:-1:1 ,i)';

part20= [part20 part20_i];

end

part20;

%-------------------(21)-------------------------

part21 = [];

for i =21:24

part21_i =x(dim:-1:dim/2 + dim/4+1,i)';

part21= [part21 part21_i];

end

part21;

%-------------------(22)-------------------------

part22= [];

for i =21:24

part22_i =x(dim/2+dim/4:-1:dim/2+1 ,i)';

part22= [part22 part22_i];

end

part22;

%-------------------(23)-------------------------

part23= [];

for i =21:24

part23_i =x(dim/2:-1:dim/4+1 ,i)';

part23= [part23 part23_i];

end

part23;

%-------------------(24)-------------------------

part24= [];

for i =21:24

part24_i =x(dim/4:-1:1 ,i)';

part24= [part24 part24_i];

end

part24;

Chaotic_Interleaver_index = [part24;part23;part22;part21;part20;part19;part18;part17;part16;part15;part14;part13 ...

;part12;part11;part10;part9;part8;part7;part6;part5;part4;part3;part2;part1];

Chaotic_Interleaver_index_frame = [part24,part23,part22,part21,part20,part19,part18,part17,part16,part15,part14,part13 ...

,part12,part11,part10,part9,part8,part7,part6,part5,part4,part3,part2,part1];

[Zeina Abdullah]

@Benjamin iam add a new question about this problem in my profile if you can please answer me . and i will add Accepted Answer to you