[R-sig-Geo] Switching from Matlab to R

[Roger Bivand]

On Mon, 21 May 2012, Michael Sumner wrote:

> You can write out to binary or text from Matlab and read that in with
> readBin or read.table, there is also the R.matlab package to read some .mat
> files directly.
>

If you mean (particularly sparse) spatial weights in the spatial 
regression sense, then in Matlab do for example:

[i,j,w] = find(weights);
wts = [i,j,w];
save -ascii wts.txt wts

and in R

library(spdep)
lw0 <- read.dat2listw("wts.txt")
lw <- nb2listw(lw0$neighbours, glist=lw0$weights, style="W")

If more general structures, follow Mike's suggestions.

Roger

>
>
> On Monday, May 21, 2012, Saima Bashir wrote:
>
>> I want to import weight matrix into R from Matlab. Is it possible? if yes
>> then how??
>>
>> Thanks
>>
>> Saima
>>
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>>
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-- 
Roger Bivand
Department of Economics, NHH Norwegian School of Economics,
Helleveien 30, N-5045 Bergen, Norway.
voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no