R help - Jul 2011 - 3d plotting with cloud and wireframe

Hi,

I'm trying to plot an equation in two variables to get a feel
for sensitivity to its parameters. I've run expand.grid to get made-up
vectors of the combinations of the two independent variables, and am trying
to plot the output of the dependent, M, against both the dependent in a 3d
space.

 t <- 0:100
 DBH <- 10:100
 TxDBH<-expand.grid(t,DBH)
 time<-TxDBH[,1]
 dbh<-TxDBH[,2]
 M <- 4000*(1-exp(-time*(1.104-(0.67*0.7)-0.163*log(dbh))^2))

I've tried wireframe(M~t|DBH, data=TxDBH)
 wireframe(M~time|dbh, data=M)
 wireframe(M~time|dbh)
 also the above model specifications using cloud.

but

 I get the following errors:
 Error in latticeParseFormula(formula, data, dimension = 3, subset = subset,
 :
  invalid model
Error in eval(substitute(groups), data, environment(formula)) :
  numeric 'envir' arg not of length one

any advice much appreciated.

*Ben *

	[[alternative HTML version deleted]]

Hi:

This worked for me:

t <- 0:100
DBH <- 10:100
TxDBH<-expand.grid(t, DBH)
rm(t, dbh)
time<-TxDBH[,1]
dbh<-TxDBH[,2]
M <- 4000*(1-exp(-time*(1.104-(0.67*0.7)-0.163*log(dbh))^2))

df <- data.frame(time, dbh, M)
library('lattice')
wireframe(M ~ time + dbh, data = df)

# Check the versions of R and lattice below against yours
# If there's a mismatch, try to upgrade
> sessionInfo()
R version 2.13.1 (2011-07-08)
Platform: i386-pc-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  grid      methods
[8] base

other attached packages:
 [1] colorspace_1.1-0 hexbin_1.26.0    rgeos_0.1-8      stringr_0.5
 [5] maptools_0.8-9   sp_0.9-83        foreign_0.8-44   quantmod_0.3-15
 [9] TTR_0.20-2       xts_0.8-0        zoo_1.7-0        Defaults_1.1-1
[13] RODBC_1.3-2      sos_1.3-1        brew_1.0-6       lattice_0.19-30
[17] ggplot2_0.8.9    proto_0.3-9.2    reshape_0.8.4    plyr_1.5.2

loaded via a namespace (and not attached):
[1] digest_0.5.0 tools_2.13.1

HTH,
Dennis

On Thu, Jul 21, 2011 at 7:40 PM, Benjamin Caldwell
<btcaldwell at berkeley.edu> wrote:
> Hi,
>
> I'm trying to plot an equation in two variables to get a feel
> for sensitivity to its parameters. I've run expand.grid to get made-up
> vectors of the combinations of the two independent variables, and am trying
> to plot the output of the dependent, M, against both the dependent in a 3d
> space.
>
> ?t <- 0:100
> ?DBH <- 10:100
> ?TxDBH<-expand.grid(t,DBH)
> ?time<-TxDBH[,1]
> ?dbh<-TxDBH[,2]
> ?M <- 4000*(1-exp(-time*(1.104-(0.67*0.7)-0.163*log(dbh))^2))
>
> I've tried wireframe(M~t|DBH, data=TxDBH)
> ?wireframe(M~time|dbh, data=M)
> ?wireframe(M~time|dbh)
> ?also the above model specifications using cloud.
>
> but
>
> ?I get the following errors:
> ?Error in latticeParseFormula(formula, data, dimension = 3, subset =
subset,
> ?:
> ?invalid model
> Error in eval(substitute(groups), data, environment(formula)) :
> ?numeric 'envir' arg not of length one
>
> any advice much appreciated.
>
> *Ben *
>
> ? ? ? ?[[alternative HTML version deleted]]
>
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