If you have a little bit of time, check out Ross Ihaka's Lectures on
"Information Visualisation". The specific examples he gives are built
with R:

~ihaka/120/

Time could be required because this stuff is so great that you want to
read all of it

Christophe.

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 matrix z is obviously of length(x)+1 times length(y)+1 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 (AT) stat (DOT) math.ethz.ch mailing list
>
>PLEASE do read the posting guide!
>

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 [S]).
-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 matrix z is obviously of
>length(x)+1 times length(y)+1 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 (AT) stat (DOT) math.ethz.ch mailing list
>
>PLEASE do read the posting guide!

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 NT 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 [S]).
>
>-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 matrix z is obviously of
>>length(x)+1 times length(y)+1 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 (AT) stat (DOT) math.ethz.ch mailing list
>>
>>PLEASE do read the posting guide!
>
>

>
>Don MacQueen
>Environmental Protection Department
>Lawrence Livermore National Laboratory
>Livermore, CA, USA
>
>
>R-help (AT) stat (DOT) math.ethz.ch mailing list
>
>PLEASE do read the posting guide!