[R] Excluding rows from a matrix - best option

[José Ernesto Jardim]

José Ernesto Jardim wrote:

> Hi
>
> I have a matrix (4 x 950) and I want to remove 3 rows, where the values
> from the first column are 713, 714 and 715. I can select the rows, one
> by one, with
>
> mat[mat$first==713,]
> mat[mat$first==714,]
> ...
>
> but I'm unable to (i) select the 3 rows at once, (ii) select the matrix
> excluding those rows.
>
> How can I do it ?
>
> Thanks
>
> EJ
>

The best way I found after these messages and with your help was

(i) selecting diferent rows

mat[(mat$first==c(###, ###, ...)),]

(ii) excluding diferent rows

mat[!(mat$first==c(###, ###, ...)),]

Because there were so many diferent options I'm posting this as a 'best option'
for the problem.

Thanks all

EJ

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