Bulk update in subset obtained from dataframe filtering [duplicate]

Answer 1

You could do

sales_data$status[
 sales_data$month == 'Jan' & sales_data$dept_name == 'Production'] <- "Good result"

Using replace

sales_data$status <- with(sales_data, 
     replace(status, month == 'Jan' & dept_name == 'Production', "Good result"))

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We can also integrate this in dplyr chain.

library(dplyr)

sales_data %>%
   mutate(status = replace(status, month == 'Jan' & dept_name == 'Production', 
                   "Good result"))

or with case_when

sales_data %>%
 mutate(status = case_when(month == 'Jan' & dept_name =='Production'~"Good result",
                           TRUE ~ status))

subset filter the dataframe based on conditions provided and does not update them.