how do I generate a spiral matrix which starts from first element

there is a command which takes only one arguement as a dimension of a square spiral matrix.But I need a way to generate such a matrix which takes the numbers of rows and columns as inputs and it might not be a square

[darova]

I don't understand. How this matrix should looks like? Can you please show some scheme?

Answer 1

[PIYUSH AGGARWAL]

You will have to write your own code for this.

A = zeros(3,6);%You can change this mxn to whatever dims you like, be it square(m=n) or rectangular matrix.
[m,n] = size(A);
%m = no of rows
%n = no of columns
%A = matrix to be filled with spiral values
 %This code works fine. I commented an eg also below
top = 1;
bottom = m;
left = 1;
right = n; %To keep track of the four directions

value = 1;%Let us strat from 1

while true
    %Top Row First
    if left>right
        break;
    end
    for i = left:right
        A(top,i) = value;
        value = value + 1;
    end
    top = top + 1;
    %Then The RightMost Column
    if top>bottom
        break;
    end
    for i = top:bottom
        A(i,right) = value;
        value = value + 1;
    end
    right = right - 1;
    %Then Bottom Row
    if left>right
        break;
    end
    for i = right:-1:left
        A(bottom,i) = value;
        value = value + 1;
    end
    bottom = bottom - 1;
    %Then The Left Column
    if top>bottom
        break;
    end
    for i = bottom:-1:top
        A(i,left) = value;
        value = value + 1;
    end
    left = left + 1;
end
A

[PIYUSH AGGARWAL]

My Code Generates Matrix like this

1 2 3 4 5 6

14 15 16 17 18 7

13 12 11 10 9 8

I guess this is what you wanted. Right? Matrix printing in spiral order?

[darova]

- SPIRAL

[Hatake nara]

Thanks a bunch,people.My issue is resolved.See Piyush's answer and comment for help.

[Matsh]

So the uzumaki_matrix is done then.What about dx_ball?:)

[Arshub]

@PIYUSH AGGARWAL Please, I hope that you can help me in modifying your code so that I enter an array from me like A= [2 3 5

12 13 14

19 0 4]

and a spiral display is made for it, then I want another code in which I can retrieve my original array. I would be grateful for your help.