[R] Matrix Results

[RMSOPS]

Hello


Error: could not find function sqldf:

Hello, I'm using R Studio, and installed the option of installing the
packages sqldbf function.
    But When I run the code give the next error.


install.packages("sqldf")
library("RSQLite") 
require(sqldf)
 x <- read.fwf(textConnection("4 - 4       56
+ 4 - 3       61
+ 3 - 3       300
+ 3 - 3        27
+ 3 - 3       33
+ 3 - 3       87
+ 3 - 4      49
+ 4 - 4      71
+ 4 - 3     121
+ 3 - 4     138
+ 4 - 3      15"), width = c(7,8) , header = FALSE, as.is = TRUE)
closeAllConnections()
 sqldf("
+     select V1
+             , count(*) as Freq
+             , min(V2) as Min
+             , max(V2) as Max
+             , median(V2) as Median
+         from x
+         group by V1
+ ")


ERROR: lazy loading failed for package ‘sqldf’
* removing ‘/home/ricardosousa/R/x86_64-pc-linux-gnu-library/2.13/sqldf’
Warning in install.packages :
  installation of package 'sqldf' had non-zero exit status

The downloaded packages are in
	‘/tmp/RtmpS53jrJ/downloaded_packages’



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