library(faahKO)
library(xcms)
xs_dens <- group(faahko,method="density")
xs_near <- group(faahko,method="nearest")
xs_filled_dens <- fillPeaks(xs_dens)
xs_filled_near <- fillPeaks(xs_near)
> xs_dens
An "xcmsSet" object with 12 samples
Time range: 2506.1-4147.7 seconds (41.8-69.1 minutes)
Mass range: 200.1-599.3338 m/z
Peaks: 4776 (about 398 per sample)
Peak Groups: 407
Sample classes: KO, WT
Profile settings: method = bin
step = 0.1
Memory usage: 0.709 MB
> xs_filled_dens
An "xcmsSet" object with 12 samples
Time range: 2502.9-4150.8 seconds (41.7-69.2 minutes)
Mass range: 200.1-599.3338 m/z
Peaks: 6121 (about 510 per sample)
Peak Groups: 407
Sample classes: KO, WT
Profile settings: method = bin
step = 0.1
Memory usage: 0.831 MB
>
> xs_near
An "xcmsSet" object with 12 samples
Time range: 2506.1-4147.7 seconds (41.8-69.1 minutes)
Mass range: 200.1-599.3338 m/z
Peaks: 4776 (about 398 per sample)
Peak Groups: 1496
Sample classes: KO, WT
Profile settings: method = bin
step = 0.1
Memory usage: 0.86 MB
> xs_filled_near
An "xcmsSet" object with 12 samples
Time range: 2501.4-4150.8 seconds (41.7-69.2 minutes)
Mass range: 200.1-599.4 m/z
Peaks: 17952 (about 1496 per sample)
Peak Groups: 1496
Sample classes: KO, WT
Profile settings: method = bin
step = 0.1
Memory usage: 2.16 MB
Not sure if we are talking about the same thing but the number of peak groups seem to stay constant in this example.