Decimal read in does not change

I try to read in a .csv file with, example, such a column:

These values are meant like they are representing thousands of hours, not two or three hours and so on.
When I try to change the reading in options through

read.csv(file, sep = ";, dec = ".") nothing changes. It doesn’t matter what I define, dec = "." or dec = "," it will always keep these numbers above.

>Solution :

You can use the following code:

library(readr)
df <- read_csv('data.csv', locale = locale(grouping_mark = "."))
df

Output:

# A tibble: 4 × 1
  `X-ray`
    <dbl>
1    2771
2    3783
3    1267
4    7798

As you can see, the values are now thousands.