Create a bdsmatrix from a list
Routines that create identity-by-descent (ibd) coefficients
often output their results as a list of values (i, j, x[i,j]),
with unlisted values of the x matrix assumed to be zero.
This routine recasts such a list into
bdsmatrix.ibd(id1, id2, x, idmap, diagonal)
row identifier for the value, in the final matrix.
column identifier for the value, in the final matrix.
the value to place in the matrix
a two column matrix or data frame.
Sometimes routines create output with integer values for
If diagonal elements are not preserved in the list, this value
will be used for the diagonal of the result.
If the argument appears, then the output matrix will contain
an entry for each value in
The routine first checks for non-symmetric or otherwise inconsistent input.
It then groups observations together into ‘families’ of
related subjects, which determines the structure of the final matrix.
As with the
singletons with no relationships are first in the output matrix, and
then families appear one by one.
bdsmatrix object representing a
block-diagonal sparse matrix.
bdsmatrix, kinship, coxme, lmekin
1 2 3 4
## Not run: ibdmat <- bdsmatrix.ibd(i,j, ibdval, idlist=subject) ## End(Not run)
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