Finding largest data from table

Lets say that I have a table containing three matricies of different lengths.

X1=[9 6 9 0;3 2 7 0];
X2=[0 2;4 0];
X3=[3 1 2; 8 9 7];

X=table(X1,X2,X3)

X = 2×3 table
           X1             X2          X3     
    ________________    ______    ___________

    9    6    9    0    0    2    3    1    2
    3    2    7    0    4    0    8    9    7

How can i I find the longest one? Is there a way to find more then one matrix of a specific lenght? Lets say the ones that are the longest.

[Chunru]

Show what the data you have by giving a minimum example.

Answer 1

[Chunru]

X1=[9 6 9 0;3 2 7 0];
X2=[0 2;4 0];
X3=[3 1 2; 8 9 7];
X4 = X1;
X=table(X1,X2,X3,X4)

X = 2×4 table
           X1             X2          X3                X4       
    ________________    ______    ___________    ________________

    9    6    9    0    0    2    3    1    2    9    6    9    0
    3    2    7    0    4    0    8    9    7    3    2    7    0

len = table2array(varfun(@(x) size(x, 2), X));
% max will find 1 entry only
[lmax, idx] = max(len)

lmax = 4

idx = 1

% if you want multiple entries
idxall = find(len == lmax)

idxall = 1×2

1 4

[Sebastian Daneli]

Thx

[Seth Furman]

The only thing I would add is that

@(x) size(x, 2)

ans = function_handle with value:
    @(x)size(x,2)

can be replaced with

@width

ans = function_handle with value:
    @width

since the width function returns the number of variables in a table or the number of columns in an array.

e.g.

X1 = [9 6 9 0;3 2 7 0];
X2 = [0 2;4 0];
X3 = [3 1 2; 8 9 7];
X4 = X1;
X = table(X1,X2,X3,X4)

X = 2×4 table
           X1             X2          X3                X4       
    ________________    ______    ___________    ________________

    9    6    9    0    0    2    3    1    2    9    6    9    0
    3    2    7    0    4    0    8    9    7    3    2    7    0

varfun(@width, X, "OutputFormat", "uniform")

ans = 1×4

4 2 3 4

https://www.mathworks.com/help/matlab/ref/width.html