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![Introducción a R
> Sys.Date()
[1] "2015-05-10"
> Sys.time()
[1] "2015-05-10 18:28:32 IST"](https://image.slidesharecdn.com/whatisrinspanish-150821123104-lva1-app6892/75/What-is-r-in-spanish-33-2048.jpg?cb=1668561087)
![Inspección de Calidad de los Datos
• head()
• tail()
• names()
• str()
• objectname[I,m]
• objectname$variable](https://image.slidesharecdn.com/whatisrinspanish-150821123104-lva1-app6892/75/What-is-r-in-spanish-93-2048.jpg?cb=1668561087)
![grepl
> ajay=c("Ajay","Vijay","Rjay","Howard")
> grepl("jay",ajay)
[1] TRUE TRUE TRUE FALSE
> ifelse(grepl("jay",ajay),"Ye...](https://image.slidesharecdn.com/whatisrinspanish-150821123104-lva1-app6892/75/What-is-r-in-spanish-97-2048.jpg?cb=1668561087)
![Data Selección
• object[l,m] Da el valor en l fila y columna m.
• object[l,] dará a todos los valores de l fila
• object$v...](https://image.slidesharecdn.com/whatisrinspanish-150821123104-lva1-app6892/75/What-is-r-in-spanish-104-2048.jpg?cb=1668561087)
![data.table
EL DT[i,j,by] comando tiene tres partes :
i, j y por.
Si tu piensas en la terminología
SQL ,
la i corresponde a...](https://image.slidesharecdn.com/whatisrinspanish-150821123104-lva1-app6892/75/What-is-r-in-spanish-117-2048.jpg?cb=1668561087)
![data.table
> diamonds=na.omit(diamonds)
> diamonds[,mean(price),by=color]
color V1
1: F 8240.237
2: H 9935.285
3: J 9419.6...](https://image.slidesharecdn.com/whatisrinspanish-150821123104-lva1-app6892/75/What-is-r-in-spanish-118-2048.jpg?cb=1668561087)
