Finding largest data from table
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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)
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.
1 个评论
Chunru
2021-11-15
Show what the data you have by giving a minimum example.
采纳的回答
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)
len = table2array(varfun(@(x) size(x, 2), X));
% max will find 1 entry only
[lmax, idx] = max(len)
% if you want multiple entries
idxall = find(len == lmax)
2 个评论
Sebastian Daneli
2021-11-15
The only thing I would add is that
@(x) size(x, 2)
can be replaced with
@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)
varfun(@width, X, "OutputFormat", "uniform")
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