Problem with Unique on table

When a table t is:

t =

11×4 table

Apex Left Right Type

_________ _______________ _______________ ____

0+3.0777i -1+0i 1+0i A

0+3.0777i -2.618+1.1756i -1+0i Ap

0+3.0777i -3.2361+3.0777i -2.618+1.1756i A

0+3.0777i -2.618+4.9798i -3.2361+3.0777i Ap

0+3.0777i -1+6.1554i -2.618+4.9798i A

0+3.0777i 1+6.1554i -1+6.1554i Ap

0+3.0777i 2.618+4.9798i 1+6.1554i A

0+3.0777i 3.2361+3.0777i 2.618+4.9798i Ap

0+3.0777i 2.618+1.1756i 3.2361+3.0777i A

0+3.0777i 1+0i 2.618+1.1756i Ap

0+3.0777i -1+0i 1+0i A

Why 'unique' used as:

>> tu=unique(t,'rows')

tu =

  11×4 table

      Apex            Left               Right         Type
    _________    _______________    _______________    ____

    0+3.0777i         -1+0i               1+0i          A  
    0+3.0777i          1+0i           2.618+1.1756i     Ap 
    0+3.0777i         -1+0i               1+0i          A  
    0+3.0777i     -2.618+1.1756i         -1+0i          Ap 
    0+3.0777i      2.618+1.1756i     3.2361+3.0777i     A  
    0+3.0777i     3.2361+3.0777i      2.618+4.9798i     Ap 
    0+3.0777i    -3.2361+3.0777i     -2.618+1.1756i     A  
    0+3.0777i      2.618+4.9798i          1+6.1554i     A  
    0+3.0777i     -2.618+4.9798i    -3.2361+3.0777i     Ap 
    0+3.0777i          1+6.1554i         -1+6.1554i     Ap 
    0+3.0777i         -1+6.1554i     -2.618+4.9798i     A  

produces 11 rows with tu(1,:) identical to tu(3,:) ?

Answer 1

[Walter Roberson]

Use format long g and then look at the entries again. And check out

tu.Apex(1)-tu.Apex(3)

and you will probably see a small difference.

[Krystian]

Not quite, Apexes are all the same and produce isequal=1, but i figured meanwhile that t.Left and t.Right are respectivelly 1 and 1.000 and -1 and -1.000. Now I need something like uniquetol which would work on tables. Because:

Error using uniquetol

Input A must be a real full matrix of type single or double.

Error in MySunShining (line 22)

tut=uniquetol(t)

Thanks so far.