[R] Matrix diagonal help

[Dimitri Liakhovitski]

Your question is unclear.

On Fri, Apr 23, 2010 at 5:45 AM, Usman Munir
<usman.munir06 at googlemail.com> wrote:
> Hi
>
> Suppose I have a matrix (cohort are rows and years are columns)
>
>
>
> [2000]  [2001]  [2002]  [2003]
>
> [C1]     0.01     0.03     0.02     0.09
>
> [C2]     0.06     0.05     0.07     0.11
>
> [C3]     0.1       0.5       0.4       0.98
>
> [C4]     0.7       0.6       0.2       0.77
>
>
>
>
>
> I want to extracts the diagonals to get a matrix which looks like this (C1
> becomes C2 in 2002, C2 becomes C3 in 2003 and so on)
>
>
>
> [C1]     [C2]     [C3]     [C4]
>
> [2000]  0.01     0.06     0.1       0.7
>
> [2001]  0.05     0.5       0.6       0
>
> [2002]  0.4       0.2       0          0
>
> [2003]  0.77     0          0          0
>
>
>
> The matrix can be of any size (for simplicity I have created a 4*4). Is
> there a function in R that does this? I know R has functions like R diag and
> lower triangular but that doesn’t help. Any tips will be appreciated.
>
>
> Thanks!
>
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>
>
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-- 
Dimitri Liakhovitski
Ninah.com
Dimitri.Liakhovitski at ninah.com