For loop to create a matrix array

I have a data X say

X= 1:100 (integer 1 to 100)

I want to write a for loop that will create matrix of w=10x5 (10rows, 5 columns) where by column 1 will be the first 10 elements of X (1 to 10), column 2 (11 to 20) and so on and then stop at column 5 (41 to 50) before creating another matrix say w2 (ie starting the iteration again).

I don't want to use reshape function as it won't fit into the real data I am working on.

[Matt J]

I don't want to use reshape function as it won't fit into the real data I am working on.

No, the reshape() function is exactly the thing to use for what you're talking about. What do you mean "it won't fit"?

[Cutie]

Because, I may need to create matrix of size 9 by 5. In which case I will only have 2 matrices formed from the first 90 elements (1:90) and the last 10 element can be discarded.

[Image Analyst]

For 90, what are the sizes of the two matrices?

1. 9-by-5? (in which case, my answer below works)
2. Or one matrix of 10-by-5 and the second one of 10-by-4?

[Cutie]

I appreciate @Matt J and @Image Analyst for offering your help.

Answer 1

[Matt J]

Because, I may need to create matrix of size 9 by 5. In which case I will only have 2 matrices formed from the first 90 elements (1:90) and the last 10 element can be discarded.

That doesn't disqualify reshape.

rows=9;
cols=5;

X=1:100;

M=rows*cols;
N=numel(X);

X=reshape( X(1:floor(N/M)*M)   ,rows,cols,[]);

w=squeeze(num2cell(X,[1,2]))

w = 2×1 cell array
    {9×5 double}
    {9×5 double}

[Cutie]

Thank you very much @Matt J. This works and it opens my eyes to other things.

Answer 2

[Image Analyst]

Try this

N = 100; % or 90 or some other multiple of 10
X= 1 : N; % (integer 1 to 100)
x1 = reshape(X(1:N/2)', N/10, [])

x1 = 10×5

1 11 21 31 41 2 12 22 32 42 3 13 23 33 43 4 14 24 34 44 5 15 25 35 45 6 16 26 36 46 7 17 27 37 47 8 18 28 38 48 9 19 29 39 49 10 20 30 40 50

x2 = reshape(X(N/2+1:end), N/10, [])

x2 = 10×5

51 61 71 81 91 52 62 72 82 92 53 63 73 83 93 54 64 74 84 94 55 65 75 85 95 56 66 76 86 96 57 67 77 87 97 58 68 78 88 98 59 69 79 89 99 60 70 80 90 100

If you don't want to use reshape for some weird reason, you can do it with a for loop but it will be more complicated.

X = 1 : 100;
x3 = zeros(10, 5);
x4 = zeros(10, 5);
k = 1;
for col = 1 : 5
    for row = 1 : 10
        x3(row, col) = X(k);
        x4(row, col) = X(k + 50);
        k = k + 1;
    end
end
x3

x3 = 10×5

1 11 21 31 41 2 12 22 32 42 3 13 23 33 43 4 14 24 34 44 5 15 25 35 45 6 16 26 36 46 7 17 27 37 47 8 18 28 38 48 9 19 29 39 49 10 20 30 40 50

x4

x4 = 10×5

51 61 71 81 91 52 62 72 82 92 53 63 73 83 93 54 64 74 84 94 55 65 75 85 95 56 66 76 86 96 57 67 77 87 97 58 68 78 88 98 59 69 79 89 99 60 70 80 90 100

[Cutie]

Thank you for offering your help.

[Navita]

Output not showing

[Image Analyst]

@Navita as you can see above there is an output. I ran it in the editor with the green run triangle and there is definitely an output. Just look at my Answer and you can see it.

If you don't have any output then you must have copied my code and changed it somehow.

If you have any more questions, then attach your data and code to read it in with the paperclip icon after you read this:

TUTORIAL: How to ask a question (on Answers) and get a fast answer