[R] Plotting using 'if' statements
Steve Murray
smurray444 at hotmail.com
Fri Sep 5 13:52:36 CEST 2008
Sorry! Hopefully just one more question!
I'm now trying to plot columns 3 and 6. I've tried:
> plot(January[3:6])
...but this plots columns 4 and 5 too!
I've also tried:
> plot(January[3],January[6])
> plot(January[3,6])
> plot(January[3]:January[6])
But these don't produce the right results (instead, errors!)
Again, I'm sure it's a just a small (but important) detail that I'm missing, and I'd be very grateful if anyone could help me out.
Many thanks again,
Steve
________________________________
Date: Thu, 4 Sep 2008 13:52:03 -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
Use '&':
plot(January[January[,3]> 0 & January[,3] < 2, 3:4])
On Thu, Sep 4, 2008 at 1:47 PM, Steve Murray wrote:
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
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Henrique Dallazuanna
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25° 25' 40" S 49° 16' 22" O
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