What do you mean by casting? What is the use of cast() function?

R - Interview Questions

It is used to get aggregate after melt(). So, now we have data arranged in some order, if we want to aggregate the columns with similar company_name and age, then we should use the cast() function.

Example :

Casted_data_set <- cast(new_data_set, company_name+age ~ variable, sum)

The function gives the aggregate salary and number of children with the same company and age.