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 *
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