seleccionar filas en el ejemplo de código r

Ejemplo: cómo extraer filas y columnas de marco de datos en r

df[,] #All rows and cols

df[1,] #1st row and all cols

df[1:2,] #First two rows and all cols

df[c(1,3),] #First and third row and all cols

df[1,2:3] #First row and 2nd-3rd col

df[1:2,2:3] #First,second row and Second and third cols

df[,1] #All rows and just first column

#df[,c(1,3)] # all rows and first and third col

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