-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
project.org] On Behalf Of R Novice
Sent: Tuesday, February 18, 2014 9:44 AM
To: r-help at r-project.org
Subject: [R] converting time data in R
Respected R veterans and experts,
I have a column representing time in a data frame in R.
when I call the str() function on the column it says something like
this
str(df2$Time)
Factor w/ 1441 levels "","00:01","00:02","00:03",..: 1086 1096 1111
and so on
You have some empty levels (cells) and it seems that not all data are in xx:yy format, so you need to repair it.
The thing is I want to conver this column into string type such that if
the time is less than 12:00, it should get modified to the string
"moring" , if time is between 12:00 and 6:00 , it is "daylight" and so
on.
You could transfer it to POSIX class and manipulate with logical operations. Maybe chron object can also be used for such comparisons.
The first step I thought was to convert this vector to time type of
column of data frame, so I used chron function.
I typed the following command,
df2$Time<-chron(times=df2$Time,format=c('h:m'))
Error in convert.times(times., fmt) : format h:m may be incorrect In
addition: Warning message:In is.na(out$s) : is.na() applied to non-
(list or vector) of type 'NULL"
see my first comment.
Regards
Petr
so I guessed I should have added second parameter in format so I tried
the following :
df2$Time<-chron(time=df2$Time,format=c('h:m:s'))
But still got the same error
I know this is just the first step, may be my approach too is wrong.
Can anyone suggest me how to convert these time data cells to morning,
evening , night etc.
Any help is much appreciated.
[[alternative HTML version deleted]]
________________________________
Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a jsou ur?eny pouze jeho adres?t?m.
Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav? neprodlen? jeho odes?latele. Obsah tohoto emailu i s p??lohami a jeho kopie vyma?te ze sv?ho syst?mu.
Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni tento email jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat.
Odes?latel e-mailu neodpov?d? za eventu?ln? ?kodu zp?sobenou modifikacemi ?i zpo?d?n?m p?enosu e-mailu.
V p??pad?, ?e je tento e-mail sou??st? obchodn?ho jedn?n?:
- vyhrazuje si odes?latel pr?vo ukon?it kdykoliv jedn?n? o uzav?en? smlouvy, a to z jak?hokoliv d?vodu i bez uveden? d?vodu.
- a obsahuje-li nab?dku, je adres?t opr?vn?n nab?dku bezodkladn? p?ijmout; Odes?latel tohoto e-mailu (nab?dky) vylu?uje p?ijet? nab?dky ze strany p??jemce s dodatkem ?i odchylkou.
- trv? odes?latel na tom, ?e p??slu?n? smlouva je uzav?ena teprve v?slovn?m dosa?en?m shody na v?ech jej?ch n?le?itostech.
- odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za spole?nost ??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn? zmocn?n nebo p?semn? pov??en a takov? pov??en? nebo pln? moc byly adres?tovi tohoto emailu p??padn? osob?, kterou adres?t zastupuje, p?edlo?eny nebo jejich existence je adres?tovi ?i osob? j?m zastoupen? zn?m?.
This e-mail and any documents attached to it may be confidential and are intended only for its intended recipients.
If you received this e-mail by mistake, please immediately inform its sender. Delete the contents of this e-mail with all attachments and its copies from your system.
If you are not the intended recipient of this e-mail, you are not authorized to use, disseminate, copy or disclose this e-mail in any manner.
The sender of this e-mail shall not be liable for any possible damage caused by modifications of the e-mail or by delay with transfer of the email.
In case that this e-mail forms part of business dealings:
- the sender reserves the right to end negotiations about entering into a contract in any time, for any reason, and without stating any reasoning.
- if the e-mail contains an offer, the recipient is entitled to immediately accept such offer; The sender of this e-mail (offer) excludes any acceptance of the offer on the part of the recipient containing any amendment or variation.
- the sender insists on that the respective contract is concluded only upon an express mutual agreement on all its aspects.
- the sender of this e-mail informs that he/she is not authorized to enter into any contracts on behalf of the company except for cases in which he/she is expressly authorized to do so in writing, and such authorization or power of attorney is submitted to the recipient or the person represented by the recipient, or the existence of such authorization is known to the recipient of the person represented by the recipient.