Thanks. But when I apply your codes I get all NA instead of TRUE and FALSE

________________________________
From: PIKAL Petr <petr.pi...@precheza.cz>
Sent: Wednesday, August 23, 2017 11:20:00 AM
To: Patrick Casimir; r-help@r-project.org
Subject: RE: Comparing 2 dale columns

Hi

your code is wrong.

I get
> test<-read.table("clipboard", header=T)
> str(test)
'data.frame':   2 obs. of  2 variables:
 $ COL1: Factor w/ 2 levels "6/1/14","7/1/14": 1 2
 $ COL2: Factor w/ 1 level "5/1/15": 1 1
> test$COL2<- as.Date(as.character(test$COL2, format="%y/%m/%d"))
> test$COL1<- as.Date(as.character(test$COL1, format="%y/%m/%d"))
                                                                                
 ^^^^^^^^^^^^^^^^^^^^^^^
incorrect parentheses position, wrong y,m,d

Using correct syntax I get correct result.

> test$COL2<- as.Date(test$COL2, format="%d/%m/%y")
> test$COL1<- as.Date(test$COL1, format="%d/%m/%y")
>
> test$COL2 > test$COL1
[1] TRUE TRUE
> test
        COL1       COL2
1 2014-01-06 2015-01-05
2 2014-01-07 2015-01-05
>

Cheers
Petr

> -----Original Message-----
> From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Patrick
> Casimir
> Sent: Wednesday, August 23, 2017 4:54 PM
> To: r-help@r-project.org
> Subject: [R] Comparing 2 dale columns
>
> Dear R fellows,
>
>
> I created a new column Date_flag to compare the dates of COL1 and COL2
> using the code below. But it showed that 5/1/15 is greater than 6/1/2014 and
> 5/1/2015 greater than
> 7/1/2014 despite the year is greater. How do I fix that? I did try to format 
> as
> %y/%m/%d
>
>  but it does not fix that.
>
>
> data$Date_Flag <- ifelse(data$COL2 > data$COL1, 0,1)
>
>
> COL1       COL2
> 6/1/14     5/1/15
> 7/1/14     5/1/15
>
>
> data$COL2<- as.Date(as.character(data$COL2, format="%y/%m/%d"))
> data$COL1<- as.Date(as.character(data$COL1, format="%y/%m/%d"))
>
>
>       [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstat.ethz.ch%2Fmailman%2Flistinfo%2Fr-help&data=02%7C01%7Cpatrcasi%40nova.edu%7Cbf182d25cae845ec841c08d4ea3a7139%7C2c2b2d312e3e4df1b571fb37c042ff1b%7C0%7C0%7C636390984126927971&sdata=Tait17GF8fuEBwFnDZHCgnc7v88yXqAxpTX7W76O1cA%3D&reserved=0
> PLEASE do read the posting guide 
> https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.R-project.org%2Fposting-guide.html&data=02%7C01%7Cpatrcasi%40nova.edu%7Cbf182d25cae845ec841c08d4ea3a7139%7C2c2b2d312e3e4df1b571fb37c042ff1b%7C0%7C0%7C636390984126927971&sdata=H3xZXXDLx4sN23A4HoUp1bElRZfWfPT1HbOaRMSDCjI%3D&reserved=0
> and provide commented, minimal, self-contained, reproducible code.

________________________________
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.

        [[alternative HTML version deleted]]

______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Reply via email to