[R] Plotting using 'if' statements

[Steve Murray]

Ah that's great, thank you very much.

As a follow-on, in the same format, how would I plot where column 3 is greater than 0 *but also less than 2*?

Once again, any help is much appreciated.


Thanks,

Steve

________________________________
Date: Thu, 4 Sep 2008 13:39:12 -0300
From: wwwhsd at gmail.com
To: smurray444 at hotmail.com
Subject: Re: [R] Plotting using 'if' statements
CC: r-help at r-project.org

Try this:

plot(January[January[,3]> 0, 3:4])

On Thu, Sep 4, 2008 at 1:28 PM, Steve Murray  wrote:





Dear all,



I have a dataset of four columns, and I wish to plot (as a scatter graph) the values of the third column where the values are greater than zero, and the fourth column.



I tried doing this via the plot command itself, but got into a bit of a mess (resulting in errors!). My dataframe is called 'January':



> plot(January[3(>0):4])

Error: unexpected '>' in "plot(January[3(>"





After a few variations on this, I thought I'd try making a new object which includes all values from the third column of January>0 (to plot in a separate step) as follows:



> JanFilter <- January[3]>0



No error here. However, when I display the 'values' of JanFilter, it shows that instead of keeping the numerical values, the above operation simply displays the results of the logical test:



> head(JanFilter)

                            Value

[1,]                       FALSE

[2,]                        TRUE

[3,]                        TRUE

[4,]                        TRUE

[5,]                        TRUE

[6,]                        TRUE





[[elided Hotmail spam]]



So my question is, how do I perform 'if' statements in order to filter out various parts of a dataset, for plotting on a graph.



Many thanks,



Steve



______________________________________________

R-help at r-project.org mailing list



PLEASE do read the posting guide http://www.R-project.org/posting-guide.html

and provide commented, minimal, self-contained, reproducible code.




--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O