Pessoal, mesmo após instalar a biblioteca "plyr" :
install.packages("plyr")
Installing package into ‘C:/Users/Sebastião Oliveira/Documents/R/win-library/3.5’ (as ‘lib’ is unspecified) trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.5/plyr_1.8.4.zip' Content type 'application/zip' length 1298514 bytes (1.2 MB) downloaded 1.2 MB
package ‘plyr’ successfully unpacked and MD5 sums checked
Ao executar o comando count ele aparece o seguinte erro:
auxiliar <- count(aulas, vars="course_id")
Error in count(aulas, vars = "course_id") : could not find function "count"
Gostaria de saber como resolver esse problema, já que impede de prosseguir para os outros seguintes.
