Eva - 5 months ago 13

R Question

I was using the command below to convert minutes (e.g. 366) to hours and minutes format (e.g. 6:06) when I came across a strange error:

`library(chron) #https://cran.r-project.org/web/packages/chron/chron.pdf`

sub(":\\d{2}", "", times((X%/%60 + X%%60 /3600)/24))

I assign a vector in the place of X in the actual code, for now I will just use a number. For example:

`sub(":\\d{2}", "", times((240.8%/%60 + 240.8%%60 /3600)/24))`

Yields "04:01" as it should be. However, the same command with 419.8 minutes wrongly gives "6:00"?

`sub(":\\d{2}", "", times((419.8%/%60 + 419.8%%60 /3600)/24))`

When I re-run it without the digit, 419, it is correct again. "06:59". I re-ran the code with random numbers and it seems to be doing fine with others. I can't understand the problem. What am I doing wrong?

Answer

```
library(chron)
times((419.8%/%60 + 419.8%%60 /3600)/24)
# [1] 06:01:00
times((419%/%60 + 419%%60 /3600)/24)
# [1] 06:00:59
```

The problem is in your `sub`

regex. Try:

```
sub(":\\d{2}$", "", times((419%/%60 + 419%%60 /3600)/24))
# [1] "06:00"
sub(":\\d{2}$", "", times((419.8%/%60 + 419.8%%60 /3600)/24))
# [1] "06:01"
```

**Update**:

Additionally, your math is *incorrectly* converting minutes to seconds. Try:

```
times((419.8%/%60 + 419.8%%60 / 60)/24)
# [1] 06:59:48
sub(":\\d{2}$", "", times((419.8%/%60 + 419.8%%60 / 60)/24))
# [1] "06:59"
```