add diagonal to existing score matrix objects

[jefferis]

could just be an attribute in the ff.rds object

[jefferis]

library(flycircuit)
options("flycircuit.ffdir"=getwd())
mymat=fc_attach_bigmat('mymat.ff',envir=.GlobalEnv)
xdiag=flycircuit:::diagonal(mymat,rownames(mymat))
attr(mymat,'diagonal')=xdiag
stopifnot(all.equal(xdiag[1],as.numeric(mymat[1,1])))
saveRDS(mymat,'mymat.ffrds')

[jefferis]

Fixed on flybrain. Still need to see if the new objects work fine.

[jefferis]

We can close this now. Furthermore, now that we have the ability to get the diagonal from a big.matrix at reasonable speed, this is less of an issue even for bare big.matrix objects without an added diagonal attribute.