[R] switch function

[jim holtman]

try this:

> toBuy <- trades$Trade.Status == "DEL" & trades$Buy.Sell..Cleared. == "Sell"
> toSell <- trades$Trade.Status == "DEL" & trades$Buy.Sell..Cleared. == "Buy"
> x <- trades  # make a copy to change
> x$Buy.Sell..Cleared.[toBuy] <- "Buy"
> x$Buy.Sell..Cleared.[toSell] <- "Sell"
> x
  Trade.Status Instrument.Long.Name Delivery.Prompt.Date
Buy.Sell..Cleared. Volume    Price Net.Charges..sum.
1          DEL          SUGAR NO.11               Jul/10
 Buy      1  15.2500              4.01
2          INS                 CORN               Jul/10
 Buy      2 368.0000             -8.64
3          INS                 CORN               Jul/10
 Buy      1 368.5000             -4.32
> trades
  Trade.Status Instrument.Long.Name Delivery.Prompt.Date
Buy.Sell..Cleared. Volume    Price Net.Charges..sum.
1          DEL          SUGAR NO.11               Jul/10
Sell      1  15.2500              4.01
2          INS                 CORN               Jul/10
 Buy      2 368.0000             -8.64
3          INS                 CORN               Jul/10
 Buy      1 368.5000             -4.32
>
>


On Thu, May 27, 2010 at 4:03 AM, arnaud Gaboury
<arnaud.gaboury at gmail.com> wrote:
> Dear group,
>
> Here is my df :
>
> trades <-
> structure(list(Trade.Status = c("DEL", "INS", "INS"), Instrument.Long.Name =
> c("SUGAR NO.11",
> "CORN", "CORN"), Delivery.Prompt.Date = c("Jul/10", "Jul/10",
> "Jul/10"), Buy.Sell..Cleared. = c("Sell", "Buy", "Buy"), Volume = c(1L,
> 2L, 1L), Price = c("15.2500", "368.0000", "368.5000"), Net.Charges..sum. =
> c(4.01,
> -8.64, -4.32)), .Names = c("Trade.Status", "Instrument.Long.Name",
> "Delivery.Prompt.Date", "Buy.Sell..Cleared.", "Volume", "Price",
> "Net.Charges..sum."), row.names = c(NA, 3L), class = "data.frame")
>
> I want to replace "Buy" by "Sell" and "Sell" by "Buy" in column
> "Buy.Sell..Cleared." when element in column "Trade.Status" is equal to
> "DEL".
>
> I think I can write something like this :
>
>
>>tradesnew<-sapply(trades$Buy.Sell..Cleared[which(trades$Buy.Sell..Cleared==
> "DEL"),],switch,.......)  but I don't really know how to pass further
> arguments to the switch function.
>
> Any help is appreciated.
>
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> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

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