Shows error when I try to write shape file-Re: Combing attribute table with polygon??

Thank you so much Roberts! it works.

Zia

Robert J. Hijmans wrote:

Zia, something like this might work as long as MUKEY has no NA values:

poly.data = merge(poly.data, data.table, by="MUKEY" ,all.x = TRUE)

Robert

On Wed, Jan 27, 2010 at 1:58 PM, Zia Ahmed <zua3 at cornell.edu> wrote:
 

I have created one data table and one polygon in R. Both have a 
similar type
of column.  I want to combine or join them with this column or field
("MUKEY").  Then  I will convert this polygon  as  a ESRI  shape file.
But  when  I  used  spCbind,   I got error. I think i miss something 
here.
Is there any way join attribute table with polygon? Thanks
Zia

poly.data1 <- spCbind(poly.data, data.table)
Error in spCbind(poly.data, data.table) : different numbers of rows


names(poly.data) # polygoan
[1] "AREASYMBOL" "SPATIALVER" "MUSYM"      "MUKEY"    > 
names(data.table) #
data
[1] "MUKEY" "Sand"  "Silt"  "Clay"  "pH"    "CEC"   "EC"    "SAR"   
"CaCO3"
[10] "SOM"   "BD"    "AWC"   "KSAT"  "Kf"    "Kw"    "LL"    "LEP"
   

length(poly.data$MUKEY)
      

[1] 76969
   

length(data.table$MUKEY)
      

[1] 184
    poly.data1 <- spCbind(poly.data, data.table)

combinedShp1 <- "D:/test/combined1.shp" writeOGR(poly.data1,
dsn=combinedShp1, layer="combined1", driver="ESRI Shapefile")