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st: RE: spmat idistance error


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: spmat idistance error
Date   Fri, 27 Jan 2012 19:36:53 +0000

Are you trying to create a matrix that is 24000 X 24000? 

That's perfectly legal in Mata, but your computer has to have memory to match; and evidently it doesn't. 

Note that this is nothing to do with Stata's matrix limits: the constructs here are in Mata, not Stata, and in any case no Stata marketed supports that big a -matsize-. 

No doubt the authors of these routines will provide much more specific help -- more is involved here than just one matrix -- but my guess is that you need to try something else. 

Nick 
n.j.cox@durham.ac.uk 

Ajita Atreya

 I have 24,000 observations on property prices. 
I am trying to create an inverse distance matrix with truncation (200m) to use in 
spreg command. 

I used the following code to create inverse distance matrix:
spmat idistance longitude latitude, id(id) dfunction(dhaversine) vtruncate(1/.2) normalize(minmax) banded

The matrix was created once but when I re did it I started getting the error as: Object not created-bands must be<=5516

The model I am using is :
spreg g2sls lnprice ........, id(id) dlmat(matrixname) elmat(matrixname)

I also get error messages as: Mata is out of memory 

Please suggest me how can I handle this matrix thing...Is it the memory of stata that is creating the problem??? 

PS. I am using stata12 and it works fine when I create contiguity matrix instead of inverse distance 		 	   		  

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