::: {.cell hash='Lecture_cache/revealjs/unnamed-chunk-25_a54520957b6be2daad52bf077ecd7e9e'}

```{.r .cell-code}
are.still.present = colSums(positive.count.rarefied)>0
are.still.present[1:5]
```

::: {.cell-output .cell-output-stdout}
```
P000001 P000002 P000003 P000004 P000005 
   TRUE    TRUE    TRUE    TRUE    TRUE 
```
:::
:::