[R] merge two data frames

[arnaud Gaboury]

Got it! 
First, here is the correct line :

>y=merge(value,allcon,all.y=T)

Then, I got NA because of some white space (blancs) in names of elements of
my data frame "VALUE".It came from the .csv file from where I obtained the
VALUE df. TY Excel again!
In fact, as a general advice, I would SYSTEMATICALLY add the argument
strip.white=T when I read a csv file, so all blanks are removed.




> -----Original Message-----
> From: arnaud Gaboury [mailto:arnaud.gaboury at gmail.com]
> Sent: Tuesday, May 11, 2010 4:25 PM
> To: r-help at r-project.org
> Cc: 'arnaud Gaboury'
> Subject: merge two data frames
> 
> Dear group,
> 
> I have these 2 following data frame:
> 
> allcon <-
> structure(list(DESCRIPTION = structure(1:17, .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(4.75000000000003, -14, -1.5, 7.75, 3.74999999999999,
>     5.22500000000005, 21.6999999999998, -0.0490000000000013,
>     68, 45.300, -8.5, -41, -118, 2.72999999999999, -0.900000000000002,
>     -64.25, 0), quantity = c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
>     0, 0, 0, 0, 0, 0), SHORTDESCRIPTION = c("COFFEE C", "COPPER",
>     "CORN", "CORN", "COTTON NO.2", "CRUDE OIL miNY", "GOLD",
>     "HENRY HUB NATURAL GAS", "ROBUSTA COFFEE (10)", "SILVER",
>     "SOYBEANS", "SPCL HIGH GRADE ZINC USD", "STANDARD LEAD USD",
>     "SUGAR NO.11", "SUGAR NO.11", "WHEAT", "WHEAT")), .Names =
> c("DESCRIPTION",
> "pl", "quantity", "SHORTDESCRIPTION"), row.names = c(NA, -17L
> ), class = "data.frame")
> 
> value <-
> structure(list(SHORTDESCRIPTION = structure(c(7L, 11L, 10L, 14L,
> 9L, 22L, 16L, 17L, 4L, 19L, 27L, 18L, 26L, 2L, 3L, 21L, 6L, 15L,
> 1L, 28L, 5L, 25L, 23L, 24L, 29L, 8L, 12L, 13L, 20L), .Label = c(" SUGAR
> NO.11",
> "COCOA", "COFFEE C", "COPPER", "CORN", "COTTON NO.2", "CRUDE OIL miNY",
> "FEEDER CATTLE", "GOLD", "HEATING OIL", "HENRY HUB NATURAL GAS",
> "LEAN HOG", "LIVE CATTLE", "NY HARBR GASOLINE BLDSTK", "ORANGE J.",
> "PALLADIUM", "PLATINUM", "PRIMARY NICKEL USD", "PRM HGH GD ALUMINIUM
> USD",
> "RANDOM LENGTH LUMBER", "ROBUSTA COFFEE (10)", "SILVER ", "SOYBEAN MEAL
> ",
> "SOYBEAN OIL", "SOYBEANS ", "SPCL HIGH GRADE ZINC USD", "STANDARD LEAD
> USD",
> 
> "SUGAR WHITE", "WHEAT"), class = "factor"), VALUE = c(500L, 10000L,
> 420L, 420L, 100L, 5000L, 100L, 50L, 250L, 25L, 25L, 6L, 25L,
> 10L, 375L, 10L, 500L, 150L, 1120L, 50L, 50L, 50L, 100L, 600L,
> 50L, 500L, 400L, 400L, 110L)), .Names = c("SHORTDESCRIPTION",
> "VALUE"), class = "data.frame", row.names = c(NA, -29L))
> 
> I want to merge these df:
> 
> > y=merge(value,allcon,by.x="SHORTDESCRIPTION",all=T)
> 
> Here is the result:
> 
> y <-
> structure(list(SHORTDESCRIPTION = structure(c(1L, 2L, 3L, 4L,
> 5L, 5L, 6L, 7L, 8L, 9L, 10L, 11L, 12L, 13L, 14L, 15L, 16L, 17L,
> 18L, 19L, 20L, 21L, 22L, 23L, 24L, 25L, 26L, 27L, 28L, 29L, 29L,
> 30L, 31L, 32L, 32L), .Label = c(" SUGAR NO.11", "COCOA", "COFFEE C",
> "COPPER", "CORN", "COTTON NO.2", "CRUDE OIL miNY", "FEEDER CATTLE",
> "GOLD", "HEATING OIL", "HENRY HUB NATURAL GAS", "LEAN HOG", "LIVE
> CATTLE",
> "NY HARBR GASOLINE BLDSTK", "ORANGE J.", "PALLADIUM", "PLATINUM",
> "PRIMARY NICKEL USD", "PRM HGH GD ALUMINIUM USD", "RANDOM LENGTH
> LUMBER",
> "ROBUSTA COFFEE (10)", "SILVER ", "SOYBEAN MEAL ", "SOYBEAN OIL",
> "SOYBEANS ", "SPCL HIGH GRADE ZINC USD", "STANDARD LEAD USD",
> "SUGAR WHITE", "WHEAT", "SILVER", "SOYBEANS", "SUGAR NO.11"), class =
> "factor"),
>     VALUE = c(1120L, 10L, 375L, 250L, 50L, 50L, 500L, 500L, 500L,
>     100L, 420L, 10000L, 400L, 400L, 420L, 150L, 100L, 50L, 6L,
>     25L, 110L, 10L, 5000L, 100L, 600L, 50L, 25L, 25L, 50L, 50L,
>     50L, NA, NA, NA, NA), DESCRIPTION = structure(c(NA, NA, 1L,
>     2L, 4L, 3L, 5L, 6L, NA, 7L, NA, 8L, NA, NA, NA, NA, NA, NA,
>     NA, NA, NA, 9L, NA, NA, NA, NA, 12L, 13L, NA, 16L, 17L, 10L,
>     11L, 14L, 15L), .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(NA,
>     NA, 4.75000000000003, -14, 7.75, -1.5, 3.74999999999999,
>     5.22500000000005, NA, 21.6999999999998, NA, -0.0490000000000013,
>     NA, NA, NA, NA, NA, NA, NA, NA, NA, 68, NA, NA, NA, NA, -41,
>     -118, NA, -64.25, 0, 45.300, -8.5, 2.72999999999999, -
> 0.900000000000002
>     ), quantity = c(NA, NA, 0, 0, 0, 0, 0, 0, NA, 0, NA, 0, NA,
>     NA, NA, NA, NA, NA, NA, NA, NA, 0, NA, NA, NA, NA, 0, 0,
>     NA, 0, 0, 0, 0, 0, 0), PL = c(NA, NA, -1781.25000000001,
>     3500, -387.5, 75, -1874.99999999999, -2612.50000000003, NA,
>     -2169.99999999998, NA, 490.000000000013, NA, NA, NA, NA,
>     NA, NA, NA, NA, NA, -680, NA, NA, NA, NA, 1025, 2950, NA,
>     3212.5, 0, NA, NA, NA, NA)), .Names = c("SHORTDESCRIPTION",
> "VALUE", "DESCRIPTION", "pl", "quantity", "PL"), row.names = c(NA,
> -35L), class = "data.frame")
> 
> As you can see, the last 4 rows have a NA in y$VALUE. How can I instead
> get
> the correct VALUE ?
> 
> TY for any help
> 
> 
> 
> 
> 
>