Error with Uniquetol: " Repetitive numbers not being removed"

Hi,

I have this double array by the name " GlobalNMesh", I am attaching the file.

It has some repetitive numbers, as shown

I am using

load('GlobalNMesh.mat')
c = uniquetol(GlobalNMesh)

But I am not getting correct results, repetitive numbers are not being removed...

Does anybody know what changes to make?

Answer 1

[Stephen23]

Set the tolerance to a suitable value, e.g.:

>> uniquetol(GlobalNMesh,1e-3)
ans =
         0    0.0336    0.1199    0.1331

[Bruno Luong]

Or simply display more digits to see they are actually not identical

[Chris Dan]

Thanks :)

Answer 2

[dpb]

Yeah, fix the magnitude of the tolerance interval you want distinguished--by default uniquetol(A) uses 1e-6 for single-precision inputs and 1e-12 for double-precision inputs.

Your values are different only in the 5th/6th position so need a tolerance to reflect that...

>> format long, format compact
>> diff(GlobalNMesh)
ans =
   0.033640000000000   0.086250000000000   0.000010000000000   0.013160000000000   0.000040000000000
>> fix(log10(diff(GlobalNMesh)))
ans =
    -1    -1    -4    -1    -4
>> uniquetol(GlobalNMesh,1E-4,'DataScale',1)
ans =
                   0   0.033640000000000   0.119890000000000   0.133060000000000
>>

[Chris Dan]

Thanks :)