unique combinations

You could read the help for expand.grid very carefully for the answer to this question.
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Sent from my phone. Please excuse my brevity.

Hi there,

I have a vector and would like to create a data frame, which contains
all unique combination of two elements, regardless of order.

myVec <- c(1,2,3)

what expand.grid does:

1,1
1,2
1,3
2,1
2,2
2,3
3,1
3,2
3,3

what I would like to have

1,1
1,2
1,3
2,2
2,3
3,3

Can anybody help?

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