Nothing
mextriangsp = function(U,b,options){
n <- length(b)
U <- as(U,"dgCMatrix")
Z <- .C("mextriangsp_c",as.double(U@x),as.integer(U@i),as.integer(U@p),
as.double(b),x=double(n),as.integer(n),
as.integer(options))
return(Z$x)
}
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