How many features in a group? — nFeatures • MSnbase

This function computes the number of features in the group defined by the feature variable fcol and appends this information in the feature data of object.

nFeatures(object, fcol)

Arguments

object: An instance of class MSnSet.
fcol: Feature variable defining the feature grouping structure.

Value

An updated MSnSet with a new feature variable fcol.nFeatures.

Author

Laurent Gatto

Examples

library(pRolocdata)
data("hyperLOPIT2015ms3r1psm")
hyperLOPIT2015ms3r1psm <- nFeatures(hyperLOPIT2015ms3r1psm,
                                    "Protein.Group.Accessions")
i <- c("Protein.Group.Accessions", "Protein.Group.Accessions.nFeatures")
fData(hyperLOPIT2015ms3r1psm)[1:10, i]
#>     Protein.Group.Accessions Protein.Group.Accessions.nFeatures
#> 136                   Q99PL5                                108
#> 141                   P14901                                  7
#> 169                   O89090                                  3
#> 203                 O89032-3                                  1
#> 238                   Q8R2M2                                 13
#> 239                   Q9JIG7                                  3
#> 261                   Q3TWI9                                  5
#> 268                   Q8K0H5                                  2
#> 274                   Q99NH0                                  9
#> 276                   Q9CZD3                                 24