Re: [R] Newbie guide for plot & graphics functions?

From: Don MacQueen <macq_at_llnl.gov>
Date: Sat 16 Jul 2005 - 07:11:26 EST

Significant goof in my first message. Here is the corrected version:

x <- 1:10
y <- 1:15
z <- outer(x,y)

image(x,y,z)

xb <- c(.5,x+.5)
yb <- c(.5,y+.5)
image(xb,yb,z) ## xb, yb NOT x, y

Fortunately, corrected one also succeeds.

-Don

At 8:06 AM -0700 7/15/05, Don MacQueen wrote:
>I think you have it backwards (the error message not withstanding).
>Read the documentation for image, note the beginning of the Details
>section, and then compare these two examples, both of which succeed
>on my system (R 2.1.1).
>
>x <- 1:10
>y <- 1:15
>z <- outer(x,y)
>image(x,y,z)
>
>xb <- c(.5,x+.5)
>yb <- c(.5,y+.5)
>image(x,y,z)
>
>x and y provide either the centers of the cells, or the boundaries of
>the cells. In the latter case, the lengths of x and y should be 1
>greater than the dim of z, not one less.
>
>(I'm including my full version info to be complete, but I doubt that
>you problem has to do with your platform [OS]).
>
>-Don
>
>> version
> _
>platform powerpc-apple-darwin7.9.0
>arch powerpc
>os darwin7.9.0
>system powerpc, darwin7.9.0
>status
>major 2
>minor 1.1
>year 2005
>month 06
>day 20
>language R
>
>
>At 7:23 AM -0700 7/15/05, Pete Cap wrote:
>>Hello all,
>>
>>Can anyone point me to a decent introduction to using the plotting
>>and assorted graphics functions in R?
>>
>>I keep getting simple errrors and I can't figure out why, for example:
>>
>>> image(x,y,z)
>>Error in image.default(x, y, z) : dimensions of z are not
>>length(x)(+1) times length(y)(+1)
>>> length(x)
>>[1] 206
>>> length(y)
>>[1] 40
>>> dim(z)
>>[1] 207 41
>>
>>
>>It seems to me as if R is wrong--the matrix z is obviously of
>>length(x)+1 times length(y)+1--but just as obviously I'm missing
>>something essential. Are there any "newbie" guides out there for
>>getting started?
>>TIA,
>>
>>Pete
>>
>>
>>
>>---------------------------------
>>
>>
>> [[alternative HTML version deleted]]
>>
>>______________________________________________
>>R-help@stat.math.ethz.ch mailing list
>>https://stat.ethz.ch/mailman/listinfo/r-help
>>PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
>
>
>--
>--------------------------------------
>Don MacQueen
>Environmental Protection Department
>Lawrence Livermore National Laboratory
>Livermore, CA, USA
>
>______________________________________________
>R-help@stat.math.ethz.ch mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html

-- 
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA

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Received on Sat Jul 16 07:14:44 2005

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