[R] checking for identical columns in a mxn matrix

[Rajarshi Guha]

On Wed, 2003-12-03 at 13:18, J.R. Lockwood wrote:

> list will come up with something clever.  the other issues is that you
> need to be careful when doing equality comparisons with floating point
> numbers.  unless your matrix consists of characters or integers,
> you'll need to think about some level of numerical tolerance of your
> comparison.

Yes, the matrix will always be integer.

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