# [R] Hist with Dates

Dominic Roye dominic.roye at gmail.com
Tue Jan 15 13:45:13 CET 2013

```Hello R-Helpers,

I would like to generate the frequencies of dates (data.RData).

str(data)
Date[1:43748], format: "2001-01-01" "2001-01-01" "2001-01-01" "2001-01-01"
...

test <- hist(data,"days",freq=T)
> test\$counts
[1] 27 17 12 15  6  4  5 13  5 13 15  9  7 10 11 21 10 10  9 11 15  7 10
14

but the count is wrong, because i have only 9 times 01/01/2001 etc.

> data[1:30]
[1] "2001-01-01" "2001-01-01" "2001-01-01" "2001-01-01" "2001-01-01"
[6] "2001-01-01" "2001-01-01" "2001-01-01" "2001-01-01"

"2001-01-02"
[11] "2001-01-02" "2001-01-02" "2001-01-02" "2001-01-02" "2001-01-02"
[16] "2001-01-02" "2001-01-02" "2001-01-02" "2001-01-02" "2001-01-02"
[21] "2001-01-03" "2001-01-03" "2001-01-03" "2001-01-03" "2001-01-03"
[26] "2001-01-03" "2001-01-03" "2001-01-03" "2001-01-03" "2001-01-03"

Now, when i give R the breaks.

> br <-
seq(as.Date("31.12.2000",format="%d.%m.%Y"),as.Date("01.01.2012",format="%d.%m.%Y"),by=1)
> test2<- hist(data,br,freq=T)
> test2\$counts[1:10]
[1] 12 15 17 12 15  6  4  5 13  5

In this case, neither get the right counts but limiting i get the correct
counts:

> test3<- hist(data[1:50],br[1:6],freq=T)
> test3\$counts
[1]  9 11 13  9  8

I hope someone can help me with this problem.

Thank you very much!!

Best regards,

Dominic
```