require( zoo )
inp <- c( 5, 9, 4, 2, 1 );
m <- zoo( cbind( inp ), as.Date("2003-02-01") + (0:(length(inp)-1)));
dim( m ) # [1] 5 1
dim( m[1,,drop=FALSE] ) # [1] 1 1 - ok
dim( lag( m, -1 )) # [1] 4 1 - ok
dim( rbind( m[1,,drop=FALSE], lag(m,-1) )) # NULL - converted from zoo
matrix to zoo vector!?!?
# any way to keep the last line as a zoo matrix???
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