On Nov 30, 2013, at 1:43 AM, Jim Lemon wrote:
> On 11/30/2013 07:05 AM, Jacquelyn Pless wrote:
>> Hi all,
>>
>> I am attempting to create a weights object and perform a Moran I test as
>> well. I have a very large spatial weights matrix (roughly 22,000x22,000)
>> that was created in Excel and read into R, and I'm now trying to implement:
>>
>> library(spdep)
>> SW=mat2listw(matrix)
>>
>> I am getting the following error:
>> Error in if (any(x<0)) stop ("values in x cannot be negative"): missing
>> value where TRUE/FALSE needed.
>>
>> What's going wrong here? My current matrix is all 0's and 1's, with no
>> missing values and no negative elements. What am I missing?
>>
>> I'd appreciate any advice. Thanks in advance for your help!
>>
> Hi Jacquelyn,
> The first thing I would do is enter:
>
> sum(is.na(x))
>
> and if anything other than zero is returned, you will know what's wrong. Your
> dataset has been imported from Excel, and that application is notorious for
> exporting things in the way it knows you want them to be. Not.
>
The second thing to do (since I wonder if an NA value would provoke that error)
is to run
class(matrix)
I'm guessing it's not a matrix and perhaps a dataframe. In which case then run:
lapply(matrix, class) to see if the columns are "numeric". I'm guessing they
may be "factor".
--
David Winsemius
Alameda, CA, USA
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