Hi Léa,
Try
ifelse(DistanceMatrix > 1.5, 0, 1)
HTH,
Jorge
On Sun, Sep 25, 2011 at 5:07 PM, Spartina <> wrote:
> Hello all,
>
> I'm having trouble creating an adjacency matrix.
>
> Basically, I need to turn the following distance matrix into an adjacency
> matrix based on whether values are >1.5 or not. If they are >1.5, then the
> returned value should be 0. If they are =<1.5, then the returned value
> should be 1.
>
> DistanceMatrix:
>
> A B C D E
> [1,] 0.000000 2.828427 1.581139 2.236068 2.000000
> [2,] 2.828427 0.000000 1.581139 4.123106 2.000000
> [3,] 1.581139 1.581139 0.000000 2.549510 2.121320
> [4,] 2.236068 4.123106 2.549510 0.000000 4.123106
> [5,] 2.000000 2.000000 2.121320 4.123106 0.000000
>
> I'm trying to do this via the if statement, however I can't get it to work
> and it keeps returning an error message:
>
> > if(DistanceMatrix>1.5) {0} else {1}
> [1] 1
> Warning message:
> In if (DistanceMatrix > 1.5) { :
> the condition has length > 1 and only the first element will be used
>
>
> I am brand new to R and have a very limited knowledge of functions and
> syntax. Maybe the if statement is not even the right way of tackling this
> problem....
>
> Thanks in advance for your answers!
>
> Léa
>
> --
> View this message in context:
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>
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