Home/ Questions/Q 7002857
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-27T20:59:00+00:00

Given an arbitrary R object, how can I obtain all the methods associated with

  • 0

Given an arbitrary R object, how can I obtain all the methods associated with the object?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    The closest I can think of is methods (if S3 object/function, List all available methods for an S3 generic function, or all methods for a class.), or showMethods (if S4).

    e.g.:

    > A <- matrix(runif(10))
> B <- methods(class=class(A))
> B
 [1] anyDuplicated.matrix as.data.frame.matrix as.raster.matrix*   
 [4] boxplot.matrix       determinant.matrix   duplicated.matrix   
 [7] edit.matrix*         head.matrix          isSymmetric.matrix  
[10] relist.matrix*       subset.matrix        summary.matrix      
[13] tail.matrix          unique.matrix       

   Non-visible functions are asterisked
> attr(B,'info')
                     visible                from
anyDuplicated.matrix    TRUE        package:base
as.data.frame.matrix    TRUE        package:base
as.raster.matrix       FALSE registered S3method
boxplot.matrix          TRUE    package:graphics
determinant.matrix      TRUE        package:base
duplicated.matrix       TRUE        package:base
edit.matrix            FALSE registered S3method
head.matrix             TRUE       package:utils
isSymmetric.matrix      TRUE        package:base
relist.matrix          FALSE registered S3method
subset.matrix           TRUE        package:base
summary.matrix          TRUE        package:base
tail.matrix             TRUE       package:utils
unique.matrix           TRUE        package:base

    Or for a function:

    > methods(summary)
 [1] summary.aov             summary.aovlist         summary.aspell*        
 [4] summary.connection      summary.data.frame      summary.Date           
 [7] summary.default         summary.ecdf*           summary.factor         
[10] summary.glm             summary.infl            summary.lm             
[13] summary.loess*          summary.manova          summary.matrix         
[16] summary.mlm             summary.nls*            summary.packageStatus* 
[19] summary.PDF_Dictionary* summary.PDF_Stream*     summary.POSIXct        
[22] summary.POSIXlt         summary.ppr*            summary.prcomp*        
[25] summary.princomp*       summary.srcfile         summary.srcref         
[28] summary.stepfun         summary.stl*            summary.table          
[31] summary.tukeysmooth*   

   Non-visible functions are asterisked

    ?Methods may also prove a useful read.

    • 0