Dear group, Here is my data frame:
> dput(u) structure(list(DESCRIPTION = structure(c(2L, 5L, 6L, 7L, 9L, 11L, 12L, 15L, 14L, 16L, 1L, 10L, 3L, 4L, 13L, 8L, 17L), .Label = c("COFFEE C Jul/10", "COPPER May/10", "CORN Jul/10", "CORN May/10", "COTTON NO.2 Jul/10", "CRUDE OIL miNY May/10", "GOLD Jun/10", "HENRY HUB NATURAL GAS May/10", "ROBUSTA COFFEE (10) Jul/10", "SILVER May/10", "SOYBEANS Jul/10", "SPCL HIGH GRADE ZINC USD", "STANDARD LEAD USD", "SUGAR NO.11 Jul/10", "SUGAR NO.11 May/10", "WHEAT Jul/10", "WHEAT May/10"), class = "factor"), PL = c(3500, -1874.99999999999, -2612.50000000003, -2169.99999999998, -680, 425, 1025, 1008.00000000000, -3057.59999999999, 3212.5, -1781.25000000001, -2265.0, 75, -387.5, 2950, 490.000000000013, 0), POSITION = c(-2, 3, 2, 2, 18, 3, -1, -1, 5, 5, 0, 0, 0, 0, 0, 0, 0)), .Names = c("DESCRIPTION", "PL", "POSITION" ), class = "data.frame", row.names = c(NA, -17L)) I want to give a warning message if one of the element of the POSITION column is different from zero. I tried using mapply with some line like this : > mapply(if,u$POSITION,==0,print("WARNING:POSITIONS ARE WRONG",quote=F)) But it seems it is not the correct way to pass the various arguments. Any help is appreciated *************************** Arnaud Gaboury Mobile: +41 79 392 79 56 BBM: 255B488F ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.