[R] Converting sparse matrix to data.frame in Matrix package

I am able to create a coordinate list sparse matrix this way: r = c(1,2,2,3,3) c = c(4,1,2,3,5) v = c(1,2,1,3,1) a = sparseMatrix(i=r,j=c,x=v) However, this results in an object that looks like this: a 3 x 5 sparse Matrix of class dgCMatrix [1,] . . . 1 . [2,] 2 1 . . .

Re: [R] Converting sparse matrix to data.frame in Matrix package

Is there a way to get the coordinate list vectors back from the matrix a without any prior knowledge? a [,1] [,2] [,3] [,4] [,5] [1,]00010 [2,]21000 [3,]00301 How to get: r = c(1,2,2,3,3) c = c(4,1,2,3,5) v = c(1,2,1,3,1)

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