[R] Matching

[shish matt]

I have a spatial weight file in csv that I want as listw object in R.
The file has the following 3 variables (left to right in the file) -- OID_, NID and WEIGHTS. NID stands for the neighbors and OID_ as the origins. There are 217 origins with 4 neighbors each.


I have been able to read the csv file as a data frame (test.csv). Then I tried to check whether the OID_ variable is in the right place in the dataframe. I used "match" for that using:
o
<- match(OID_, OID_)
I am not sure whether this is the right way to match. Please advice.

Anyway, next I created a matrix object (m) using:

m
<- as.matrix(test.csv[, -1])

Then I created object m1, using:

m1
<- m[o, o]

Finally, I tried creating listw object using:
mat2listw(m1)
Here I get an error that x is not a square matrix.

Not sure what to do now. Any helo appreciated!

Thanks,
Shishm