I have a matrix, I would like to use it like I use where query on an SQL table
Let's say my matrix is
> wok
who task
1 joe task1
2 joe task2
3 joe task3
4 jack task1
5 jack task2
I want to extract a matrix that contains only rows where
who = "joe" and task != "task2"
The result would be the following matrix
1 joe task1
2 joe task3
How can I do that with R ?
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