From: Don MacQueen <macq_at_llnl.gov>

Date: Sat 16 Jul 2005 - 07:11:26 EST

image(x,y,z)

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 ______________________________________________ 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.htmlReceived on Sat Jul 16 07:14:44 2005

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