test

x<-c(1, 2, 3, 4)
prod(x)         # 1*2*3*4

## [1] 24

methods("plot")

##  [1] plot.acf*           plot.data.frame*    plot.decomposed.ts*
##  [4] plot.default        plot.dendrogram*    plot.density*      
##  [7] plot.ecdf           plot.factor*        plot.formula*      
## [10] plot.function       plot.hclust*        plot.histogram*    
## [13] plot.HoltWinters*   plot.isoreg*        plot.lm*           
## [16] plot.medpolish*     plot.mlm*           plot.ppr*          
## [19] plot.prcomp*        plot.princomp*      plot.profile.nls*  
## [22] plot.R6*            plot.raster*        plot.spec*         
## [25] plot.stepfun        plot.stl*           plot.table*        
## [28] plot.ts             plot.tskernel*      plot.TukeyHSD*     
## see '?methods' for accessing help and source code