[R] Zoo or TS

[Robert W. Baer, Ph.D.]

You have not really made it clear what you are trying to do, and I don't see 
the zoo vs ts involvement in your question.
Also, your test data and code snippet you give are not quite consistent. 
Thus, my advice is  really a long-shot guess.

Assume your data looks like:
  Time Date Rank Topic Title Author
1    0 xxxx    1     A     J   PAUL
2    0 xxxx    2     B     K  PERRI
3    0 xxxx    3     C     L   WILL
4    0 xxxx    4     D     M    ANA
5    1 xxxx    1     A     J   PAUL
6    1 xxxx    2     B     L   WILL
7    1 xxxx    3     C     M    ANA
8    1 xxxx    4     D     K  PERRI

After copying it to the clipboard, you read it into R (on Windows) using the 
command:
df=read.table(file="clipboard",header=TRUE)

You type df and confirm the data is as indicated

You want to plot just the Rank for Title J at times 0 and 1 and any other 
time available in the time column. You donot use an "if" statement.  Rather 
you use conditional arguements:
plot(df$Time[df["Title"]=="J"],df$Rank[df["Title"]=="J"])

If the time variable becomes a ts or zoo object, this syntax should still 
work.

Hope this is what you are going after.

Rob Baer

----- Original Message ----- 
From: "miya" <ontiveros_paloma at yahoo.com>
To: <r-help at r-project.org>
Sent: Sunday, February 22, 2009 10:50 AM
Subject: Re: [R] Zoo or TS


>
> Thank you Tony. I tried that, but still got an error. This is what I got.
>
> if(df["Title"]=="A")
> + plot(df["B"])
>
>
> Error in `[.data.frame`(df, "Title") : undefined columns selected
>
> I Think there is something wrong with my file because when I call [,1] It
> gives me the whole data set, but when I call [,2] it gives me NULL. Any
> suggestions on what I need to do?
>
> Thank you.
>
>
>
> Tony Breyal wrote:
>>
>> I think you need to put quotes around the column header name,
>> something like: NYT["Title"]
>>
>> example:
>>> my.df <- data.frame(header1=1:3, header2=1:3)
>>> my.df[header2]
>> Error in `[.data.frame`(my.df, header2) : object "header2" not found
>>> my.df["header2"]
>>   header2
>> 1       1
>> 2       2
>> 3       3
>>
>> Hope that helps a little,
>> Tony Breyal
>>
>> On 22 Feb, 04:41, miya <ontiveros_pal... at yahoo.com> wrote:
>>> Hi everyone,
>>> I'm trying to plot some data across time. I have a list of articles,
>>> ranks,
>>> date/times, authors, etc. Someone suggested using zoo and someone
>>> suggested
>>> using ts. I'm pretty new at this and have been trying a simple if()
>>> plot()
>>> statement, but it doesn't seem to work. I keep getting an error that
>>> Title
>>> does not exist. Basically its saying that the headers do not exist as
>>> objects. Can anyone please help.
>>>
>>> Below is what I've been trying to do and a sample of the data I am
>>> working
>>> with.
>>>
>>> Thanks in advance.
>>>
>>> Time Date Rank Topic Title Author
>>> 0 xxxx 1 A J By PAUL
>>> 0 xxxx 2 B K By PERRI
>>> 0 xxxx 3 C L By WILL
>>> 0 xxxx 4 D M By ANA
>>> 1 xxxx 1 A J By PAUL
>>> 1 xxxx 2 B L By WILL
>>> 1 xxxx 3 C M By ANA
>>> 1 xxxx 4 D K By PERRI
>>>
>>> if(NYT[Title]=="For Catholics, a Door to Absolution Is Reopened")
>>> plot(NYT[Rank])
>>>
>>> Error in `[.data.frame`(NYT, Title) : object "Title" not found
>>> --
>>> View this message in
>>> context:http://www.nabble.com/Zoo-or-TS-tp22143632p22143632.html
>>> Sent from the R help mailing list archive at Nabble.com.
>>>
>>> ______________________________________________
>>> R-h... at r-project.org mailing
>>> listhttps://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting
>>> guidehttp://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> 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.
>>
>>
>
> -- 
> View this message in context: 
> http://www.nabble.com/Zoo-or-TS-tp22143632p22148792.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
>