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Find subsets of logical objects
col.any(x) col.all(x) row.any(x) row.all(x)
a rectangular object
a logical vector
# NOT RUN { x <- fts(seq(from=Sys.Date(),by="months",length.out=50),matrix(rnorm(100),nrow=50)) jj <- x > 0 row.all(jj) row.any(jj) col.any(x > 0) col.all(x > -3) # }
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