How can I perform this non circular shift in Matlab? [closed] - matlab

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I am trying to perform a non circular shift in MATLAB. I have
A = [1 2 3 4 5; 0 0 13 14 15; 21 22 23 24 25; 0 0 33 34 35 ; 41 42 43 44 45]
and
B = [1 2 3 4 5; 11 12 13 14 15; 21 22 23 24 25; 31 32 33 34 35 ; 41 42 43 44 45]
How can I shift the indexes of the even rows and is it possible to fill in the empty indexes with an integer of choice?
Desired outputs:
A =
1 2 3 4 5
13 14 15
21 22 23 24 25
33 34 35
41 42 43 44 45
B =
1 2 3 4 5
11 12 13 14 15
21 22 23 24 25
31 32 33 34 35
41 42 43 44 45
Edit: Realized I messed up the desired output of matrix B. I had accidentally omitted some of the elements. Trying to shift the variables over to the right non circularly

Answer 1

Using Indexing and Concatenation
Input Arrays:
A = [1 2 3 4 5;
0 0 13 14 15;
21 22 23 24 25;
0 0 33 34 35 ;
41 42 43 44 45];
B = [1 2 3 4 5;
11 12 13 14 15;
21 22 23 24 25;
31 32 33 34 35;
41 42 43 44 45];
Shifting Even Rows Left:
To shift the arrays you can index the arrays relative to the Shift_Factor in this case 2. You can alternatively use circshift() and overwrite the portions of the array with zeroes/the desired Fill_Value. Here a for loop with an increment value of 2 is used to iterate over all the even rows. Upon each iteration, a partition of the array A(Row,Shift_Factor+1:end) is concatenated to an arbitrary fill array Fill_Value*ones(1,Shift_Factor).
Shift_Factor = 2;
Fill_Value = 0;
[Number_Of_Rows,Number_Of_Columns] = size(A);
for Row = 2: +2: Number_Of_Rows
A(Row,:) = [A(Row,Shift_Factor+1:end) Fill_Value*ones(1,Shift_Factor)];
end
A
Shifting Even Rows Right
Shift_Factor = 2;
Fill_Value = 0;
[Number_Of_Rows,Number_Of_Columns] = size(B);
B = [B zeros(Number_Of_Rows,Shift_Factor)];
for Row = 2: +2: Number_Of_Rows
B(Row,:) = [Fill_Value*ones(1,Shift_Factor) B(Row,1:end-Shift_Factor)];
end
B
Ran using MATLAB R2019b