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I want to format numbers in my reports to significant digits , but keep trailing significant zeroes and correctly format large numbers For instance the numbers c(10.00001,12345,1234.5,123.45,1.2345,0.12345) to 3 significant digits should be 10.0, 12300, 1230, 123, 1.23, 0.123 but I get differing results with different methods (and none seem to work universaly. > numbers<-c(10.00001,12345,1234.5,123.45,1.2345,0.12345) > for(n in seq(numbers)){ + print(signif(numbers[n],digits=3)) + print(format(numbers[n],digits=3)) + print(formatC(numbers[n], digits=3,format="fg")) + print(formatC(numbers[n], digits=3,format="fg", flag="#")) + } [1] 10 [1] "10" [1] " 10" [1] "10.0" [1] 12300 [1] "12345" [1] "12345" [1] "12345." [1] 1230 [1] "1234" [1] "1234" [1] "1234." [1] 123 [1] "123" [1] " 123" [1] "123." [1] 12.3 [1] "12.3" [1] "12.3" [1] "12.3" [1] 1.23 [1] "1.23" [1] "1.23" [1] "1.23" [1] 0.123 [1] "0.123" [1] "0.123" [1] "0.123" Here, signif and format round the 10.00001 result. formatC with flag="#" correctly does the small numbers but not the large numbers. Is there a better way ?

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