Resize a matrix into another with different size

269 views (last 30 days)
Hello, i got a matrix X and I want to transform X into a matrix rows x collumns, in this case into a 4 by 7 matrix. I used reshape but it doesnt work because of the 2 nans i must create i assume.
k = 26;
X = [1:k]';
[n,m] = size(X);
rows = 4;
columns = ceil(n/rows);
Into something like that, if possible:
x(1) x(5) x(9) x(13) x(17) x(21) x(25)
x(2) x(6) x(10) x(14) x(18) x(22) x(26)
x(3) x(7) x(11) x(15) x(19) x(23) NaN
x(4) x(8) x(12) x(16) x(20) x(24) NaN

Accepted Answer

Matt J
Matt J on 26 Nov 2018
Edited: Matt J on 26 Nov 2018
extra = rows*ceil(numel(X)/rows) - numel(X);
reshape([X(:);nan(extra,1)],rows,columns)
  3 Comments

Sign in to comment.

More Answers (2)

Luna
Luna on 26 Nov 2018
Edited: Luna on 26 Nov 2018
Hi,
Try this:
k = 26;
X = [1:k]';
[n,m] = size(X);
rows = 4;
columns = ceil(n/rows);
X(numel(X):(rows*columns)) = NaN;
reshape(X,rows,columns)
  1 Comment
Tiago Dias
Tiago Dias on 26 Nov 2018
Edited: Tiago Dias on 26 Nov 2018
this one works 95% i would say, the number 26 doesnt show up :/
ans =
1 5 9 13 17 21 25
2 6 10 14 18 22 NaN
3 7 11 15 19 23 NaN
4 8 12 16 20 24 NaN
I tried this and i think it works
extra_row = rows * columns;
X(n+1:extra_row) = NaN;
X_new = reshape(X,rows,columns)

Sign in to comment.


Stephen23
Stephen23 on 26 Nov 2018
Edited: Stephen23 on 26 Nov 2018
A simpler solution:
>> X = 1:26;
>> R = 4;
>> N = numel(X);
>> M = nan(R,ceil(N/R));
>> M(1:N) = X
M =
1 5 9 13 17 21 25
2 6 10 14 18 22 26
3 7 11 15 19 23 NaN
4 8 12 16 20 24 NaN

Categories

Find more on Resizing and Reshaping Matrices in Help Center and File Exchange

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by