unique - Find unique elements of symbolic matrices or their numeric approximations

Syntax

unique(A) unique(vpa(A))

Description

unique(A) for the symbolic matrix A returns the same values as in A, but with no repetitions. The unique command also sorts the elements of the resulting vector alphabetically. If the resulting vector contains symbolic numbers, the command sorts them in ascending order.

unique(vpa(A)) for the symbolic matrix A returns the numeric approximations of the elements of A, but with no repetitions. The unique command also sorts the elements of the resulting vector in ascending order.

Examples

Sort the elements of a symbolic vector excluding duplicates:

syms a b c d e x;
unique([a b c 5 2 b c d 3 b e x x])

The result is:

ans =
[ 2, 3, 5, a, b, c, d, e, x]

Sort the elements of the symbolic Hilbert matrix:

H = sym(hilb(5));
unique(H)

The result is a column vector of unique elements:

ans =
 1/9
 1/8
 1/7
 1/6
 1/5
 1/4
 1/3
 1/2
   1

Sort the numeric approximations of the elements of the symbolic Hilbert matrix:

H = sym(hilb(5));
unique(vpa(H))

The result is:

ans =
 0.11111111111111111111111111111111
                              0.125
 0.14285714285714285714285714285714
 0.16666666666666666666666666666667
                                0.2
                               0.25
 0.33333333333333333333333333333333
                                0.5
                                1.0

unique - Find unique elements of symbolic matrices or their numeric approximations

Syntax

Description

Examples

See Also

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