R Experts,
I would like to create a series of variables without having
to assign a separate line of code for each new variable. My dataframe (DF)
contains
two groups of linked variables (ESP1:ESP9) and (ECRL1:ECRL9). Within ESP1:ESP9
are
abbreviated species codes (full dataframe contains 26 codes). ECRL1 represents
the
number of species x in variable ESP1 harvested, and so on through ESP9 and
ECRL9.
What I want to do is create 26 new variables (one for each unique species code)
that
contains the number harvested (ECRL) for each corresponding species code listed
for
each row of the data set. Example (row 14), the new variable YP Harvest would
equal
90 (ECRL2) and WP Harvest would equal 0 (ECRL1), all other species code var's
would
contain NA.
I hope I made this clear enough.
Thank you,
Mike
Current method: one line per species
EBTCH1.h$YP.H <- with(EBTCH1.h,ifelse(ESP1 %in% 'YP',ECRL1,ifelse(ESP2 %in%
'YP',ECRL2,
ifelse(ESP3 %in% 'YP',ECRL3,ifelse(ESP4 %in% 'YP',ECRL4,ifelse(ESP5 %in%
'YP',ECRL5,
ifelse(ESP6 %in% 'YP',ECRL6,ifelse(ESP7 %in% 'YP',ECRL7,ifelse(ESP8 %in%
'YP',ECRL8,
ifelse(ESP9 %in% 'YP',ECRL9,0))))))))))
DF <-
structure(list(MM = c(5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L,
5L, 5L, 5L, 5L, 5L), DD = c(3L, 3L, 3L, 3L, 3L, 3L, 7L, 7L, 7L,
8L, 8L, 8L, 8L, 8L, 8L), DTYPE = c(2, 2, 2, 2, 2, 2, 1, 1, 1,
1, 1, 1, 1, 1, 1), TOD = c(2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1,
1, 1, 1), SITENUM = c("102", "104", "104", "104", "101", "101",
"102", "103", "101", "101", "101", "101", "103", "103", "103"
), CURTIM = c(1450L, 1736L, 1755L, 1804L, 1950L, 2007L, 1150L,
1450L, 2000L, 1003L, 1030L, 1036L, 1300L, 1310L, 1320L), GRPFSH = c(2L,
2L, 2L, 2L, 2L, 3L, 1L, 2L, 3L, 2L, 4L, 1L, 1L, 3L, 1L), EEFF = c(11.5,
19, 5, 20, 0, 0, 5, 8, 0, 0, 0, 0, 3, 12, 6), ESP1 = c("SMB",
"SMB", "SMB", "SMB", NA, NA, "YP", "YP", NA, NA, NA, NA, "RG",
"WP", "WP"), ESP2 = c(NA, "RB", NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, "SMB", "YP", "YP"), ESP3 = c(NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, "RB", "RBS", NA), ESP4 = c(NA_character_,
NA_character_, NA_character_, NA_character_, NA_character_, NA_character_,
NA_character_, NA_character_, NA_character_, NA_character_, NA_character_,
NA_character_, NA_character_, NA_character_, NA_character_),
ESP5 = c(NA_character_, NA_character_, NA_character_, NA_character_,
NA_character_, NA_character_, NA_character_, NA_character_,
NA_character_, NA_character_, NA_character_, NA_character_,
NA_character_, NA_character_, NA_character_), ESP6 = c(NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA),
ESP7 = c(NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA), ESP8 = c(NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA), ESP9 = c(NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA), ECRL1 = c(0L, 0L, 0L,
0L, 0L, 0L, 4L, 5L, 0L, 0L, 0L, 0L, 0L, 0L, 0L), ECRL2 = c(0L,
0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 90L, 30L),
ECRL3 = c(0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L,
0L, 0L, 0L), ECRL4 = c(0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L,
0L, 0L, 0L, 0L, 0L, 0L), ECRL5 = c(0L, 0L, 0L, 0L, 0L, 0L,
0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L), ECRL6 = c(0L, 0L, 0L,
0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L), ECRL7 = c(0L,
0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L),
ECRL8 = c(0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L,
0L, 0L, 0L), ECRL9 = c(0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L,
0L, 0L, 0L, 0L, 0L, 0L)), .Names = c("MM", "DD", "DTYPE",
"TOD", "SITENUM", "CURTIM", "GRPFSH", "EEFF", "ESP1", "ESP2",
"ESP3", "ESP4", "ESP5", "ESP6", "ESP7", "ESP8", "ESP9", "ECRL1",
"ECRL2", "ECRL3", "ECRL4", "ECRL5", "ECRL6", "ECRL7", "ECRL8",
"ECRL9"), row.names = c(NA, 15L), class = "data.frame")
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