[R] (no subject)

[arnaud Gaboury]

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




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Arnaud Gaboury
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