Vector with two columns

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@NM_10165576 wrote:

How to apply this program, when the vector has two columns.

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If the "vector" has two columns, its no longer a vector but a general matrix 🙂

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Reference topic: https://community.ptc.com/t5/Mathcad/How-to-remove-duplicate-entries-in-an-array-using-a-program/m-p/996692 

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Somehow your link refers back to this very thread which sure was not intended.

I guess you meant this thread: Solved: How to remove duplicate entries in an array using ...

The "match" functions only works with a scalar value as its first argument (the value match should  look for) and so the variante offered in that thread don't work.

You may use a simple straight forward solution to remove duplicate rows from a matrix:

Of course it does not only work on two column matrices

but for matrices of all dimensions

and so also for vectors (= 1-column matrices) as well 😉

Remark; I assumed that you wanted to remove duplicate rows of a matrix.
If your intention was to remove rows with duplicate values in just one column (maybe the first column) - disregarding the values in the other columns, you sure could use a program similar to the ones provided in the thread you intended to link to.

BTW, none of the version would work OK if the matrix contains NaN's, because you can't check NaN's for equality - the result would always be "not equal":

NaN is also not seen as a scalar which is why "match" fails and thats the reason for the "matchNaN" function

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