Sorry, I did forget to mention the ordisurf from the vegan package.  
Thanks for all the help on this and I will download the new vegan 
working version.

Thanks again,
    --Chris

Jari Oksanen wrote:
> On Thu, 2008-10-23 at 14:44 -0500, Christopher Chizinski wrote:
>   
>> Is there a way to output the X,Y,Z values for the contour lines from 
>> ordisurf?  
>>
>> For example, I am using this statement:
>> tmp<-with(enviro,ordisurf(fish.nmds,enviro$Temp,choices=c(1,2),add=TRUE))
>>
>> names(tmp)
>>  [1] "coefficients"      "residuals"         "fitted.values"   
>>  [4] "family"            "linear.predictors" "deviance"        
>>  [7] "null.deviance"     "iter"              "weights"         
>> [10] "prior.weights"     "df.null"           "y"               
>> [13] "converged"         "sig2"              "edf"             
>> [16] "hat"               "boundary"          "sp"              
>> [19] "nsdf"              "Ve"                "Vp"              
>> [22] "mgcv.conv"         "gcv.ubre"          "aic"             
>> [25] "rank"              "gcv.ubre.dev"      "method"          
>> [28] "smooth"            "formula"           "cmX"             
>> [31] "model"             "control"           "terms"           
>> [34] "pterms"            "assign"            "offset"          
>> [37] "data"              "df.residual"       "min.edf"         
>> [40] "call"
>>
>> I would like to get these XYZ values or find a way to calculate them 
>> from the output for inclusion into SigmaPlot.  It is probably an easy 
>> solution but I could not find what I needed.
>>
>>     
> Dear Christopher Chizinski,
>
> I assume you mean the ordisurf() function in the vegan package. If you
> mean something else, this message is not appropriate and you may stop
> reading. 
>
> Function ordisurf (of vegan) returns visibly an object of function gam
> of the mgcv package (like documented). You can use all mgcv:::gam tools
> to handle this object, including predict.gam (of mgcv) which can be used
> to predict new values of surface (z) for any values of the coordinates
> (x, y). These results can be exported to SigmaPlot or anywhere. If you
> look inside the function ordisurf, you can see how predict.gam is used
> to find the predicted value of the surface for a grid of axis values.
>
> I changed the ordisurf function in
> http://r-forge.r-project.org/projects/vegan so that it now adds the data
> used by the contour() function in a new item called "grid" in the
> result. The returned data in "grid" contain vectors "x" and "y" for the
> grid values on the axis, and matrix "z" for the fitted surface values
> for each combination of "x" and "y" vectors. The values of "z" outside
> the convex hull of observed site are marked as NA. You can directly
> export these items or reuse them to draw the surface with the contour()
> command. The grid item is available from vegan working version 1.16-3
> (revision 532) in R-Forge, and Windows binary is available (probably)
> from tomorrow morning (Central European Standard Time).
>
> Best wishes, Jari Oksanen
>
>   

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