squareform - Format distance matrix
Syntax
Z = squareform(y)
y = squareform(Z)
Z = squareform(y,'tovector')
Y = squareform(Z,'tomatrix')
Description
Z = squareform(y), where y is
a vector as created by the pdist function,
converts y into a square, symmetric format Z,
in which Z(i,j) denotes the distance between the ith
and jth objects in the original data.
y = squareform(Z), where Z is
a square, symmetric matrix with zeros along the diagonal, creates
a vector y containing the Z elements
below the diagonal. y has the same format as the
output from the pdist function.
Z = squareform(y,'tovector') forces squareform to
treat y as a vector.
Y = squareform(Z,'tomatrix') forces squareform to
treat Z as a matrix.
The last two formats are useful if the input has a single element,
so that it is ambiguous whether the input is a vector or square matrix.
Examples
y = 1:6
y =
1 2 3 4 5 6
X = [0 1 2 3; 1 0 4 5; 2 4 0 6; 3 5 6 0]
X =
0 1 2 3
1 0 4 5
2 4 0 6
3 5 6 0
Then squareform(y) = X and squareform(X)
= y.
See Also
pdist
 | sortrows (ordinal) | | squeeze (categorical) |  |
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