How to take elements row wise or column wise in a 2d array

A is a 5*5 array. Its needed to take 7 elements along the 1st column and 2 from the beginning of 2nd column.So the window size is 7.Now that makes it possible to take 3 windows.So 4 elements are left.this last window should be 4 leftover elements and rest zeroes.How to have a loop that gives me the 4 windows in a variable

[per isakson]

Without a loop

>> A=magic(5);
>> reshape( [A(:);zeros(3,1)], [7,4] )
ans =
    17     6    25    16
    23    12     8    22
     4    18    14     3
    10     1    20     9
    11     7    21     0
    24    13     2     0
     5    19    15     0

[MSP]

But can u pls generalize it

[per isakson]

In your question you say

• "a 5*5 array" &nbsp
• "take 7 elements [window] along" &nbsp
• "that gives me the 4 windows in a variable" &nbsp
• "matrix signalprocess" &nbsp

"generalize" &nbsp Yes, but in what way? Arbitrary size of the input matrix and/or the window? Along columns or rows? ...

Answer 1

[Walter Roberson]

https://www.mathworks.com/help/signal/ref/buffer.html

buffer(A(:), 7)

[Walter Roberson]

window = 7;
A = randi(5,5);

n = numel(A);
left_over = mod(n, window);
if left_over == 0
  stream = A(:);
else
  stream = [A(:); zeros(window - left_over, 1)];
end

output = reshape(stream, window, []);