Re: [R] building a spatial matrix

Hi Sarah, thanks a lot. In this line: result.m[cbind(factor(result$f_cell), factor(result$f_cell_neigh))] <- result$distance I had a problem with cbind(factor .. : the assignement to the [i,j] element of the matrix did not work. I solved in this manner: - I modified censDist, so for every coupl

Re: [R] building a spatial matrix

*PLEASE IGNORE THE PREVIOUS EMAIL, IT WAS SENT BY MISTAKE* Hello Sarah thanks a lot for your advice. I followed your suggestions unitil the creation of "result" The allocation of the values of result$distance to the matrix result.m, however ,does not seem to work: it produces a matrix with ident

Re: [R] building a spatial matrix

Sorry, you're right. The result line should be: result.m[cbind(factor(result$fcell), factor(result$cellneigh))] <- result$distance idcell <- data.frame( id = seq_len(5), fcell = sample(1:100, 5)) censDist <- expand.grid(fcell=seq_len(100), cellneigh=seq_len(100)) censDist$distance <- runi

Re: [R] building a spatial matrix

Hello Sarah thanks a lot for your advice. I followed your suggestions unitl the creation of "result" The allocation of the values of result$distance to the matrix result.m, however ,does not seem to work: it produces a matrix with identical columns corresponding to the last values of result$dista

Re: [R] building a spatial matrix

I don't see any reason why a loop is out of the question, and answering would have been much easier if you'd included the requested reproducible data, but what about this? This solution is robust to pairs from idcell being absent in censDist, and to the difference from A to B being different than

[R] building a spatial matrix

Hello, I have a sample of 1327 locations, each one idetified by an id and a numerical code. I need to build a spatial matrix, say, M, i.e. a 1327x1327 matrix collecting distances among the locations. M(i,i) should be 0, M(i,j) should contain the distance among location i and j I shoud use data