about data format in R

?substring

(among others)

-- Bert
Bert Gunter

"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Sat, Dec 31, 2016 at 9:26 AM, lily li <chocold12 at gmail.com> wrote:

Hi all,

Thanks for your help. Now I can convert data to the format "yyyy-mm-dd
hh:mm:ss", but how to convert it to "yyyy-mm-dd"? The datasets are txt
files, not from excel.

On Fri, Dec 30, 2016 at 3:01 PM, Duncan Mackay <dulcalma at bigpond.com>

wrote:

Hi

Is this the output from Excel?
If so format it in Excel for a date format not a date-time format .
Depending how the dates were inputted into Excel and the Excel setup a

date

may not be a date format.
There are no rules with microsoft formatting so beware!


Regards

Duncan

Duncan Mackay
Department of Agronomy and Soil Science
University of New England
Armidale NSW 2351
Email: home: mackay at northnet.com.au

-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of lily li
Sent: Saturday, 31 December 2016 05:38
To: Rui Barradas
Cc: R mailing list
Subject: Re: [R] about data format in R

Hi Rui,

Thanks for your reply. When I read in data using my code, the first

column

ranges from 0 to 1. So when I use the code you wrote, it shows the error
message:
Error in as.POSIXct.numeric(DF$Date, format = "%m/%d/%Y-%H:%M:%S") :
'origin' must be supplied


On Fri, Dec 30, 2016 at 11:23 AM, Rui Barradas <ruipbarradas at sapo.pt>
wrote:

Hello,

Have you tried

df$date <- as.POSIXct(dat$date, format = "%m/%d/%Y-%H:%M:%S")

?

Hope this helps,

Rui Barradas



Em 30-12-2016 17:40, lily li escreveu:

Hi R users,

I'm trying to read in data, and then plot time series data. However,

I

have
some problems. In my dataset, the first column represents time, and

in

the

format:
mm/dd/yyyy-hr:min:sec; For example, 10/01/1995-00:00:00,
10/01/1995-06:00:00, etc.

df:
            date                    evap     precip    intercept
10/01/1995-00:00:00       1.5          2            0.2
10/01/1995-12:00:00       1.7          2.2         0.1
10/02/1995-00:00:00       1.5          1.8         0.3
...

My code is like this
file1 = read.table('df', head=T)

When I read in data, I found that it read incorrectly. How to format

when

read in data? Thanks.

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