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June 1, 2017 05:35
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Investigating the wrapr let function
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##### set up####### | |
library(dplyr) | |
library(wrapr) | |
data<-structure(list(Location = c("AreaZ", "AreaZ", "AreaZ", "AreaZ", | |
"AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", | |
"AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", | |
"AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", | |
"AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", | |
"AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", | |
"AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", | |
"AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", | |
"AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", "AreaZ", | |
"AreaZ", "AreaZ", "AreaZ", "AreaZ"), Date = structure(c(14761, | |
14791, 14822, 14853, 14883, 14914, 14944, 14975, 15006, 15034, | |
15065, 15095, 15126, 15156, 15187, 15218, 15248, 15279, 15309, | |
15340, 15371, 15400, 15431, 15461, 15492, 15522, 15553, 15584, | |
15614, 15645, 15675, 15706, 15737, 15765, 15796, 15826, 15857, | |
15887, 15918, 15949, 15979, 16010, 16040, 16071, 16102, 16130, | |
16161, 16191, 16222, 16283, 16314, 16344, 16375, 16436, 16467, | |
16495, 16526, 16556, 16587, 16617, 16648, 16679, 16709, 16770 | |
), class = "Date"), y = c(6, 3, 8, 18, 18, 2, 15, 11, 24, 11, | |
13, 13, 11, 10, 19, 5, 12, 14, 20, 3, 22, 15, 16, 24, 10, 18, | |
18, 38, 15, 23, 24, 23, 27, 27, 31, 18, 20, 20, 26, 22, 19, 21, | |
26, 25, 19, 19, 31, 23, 23, 21, 28, 23, 28, 35, 23, 29, 38, 22, | |
25, 23, 28, 33, 31, 20)), class = "data.frame", row.names = c(NA, -64L), .Names = c("Location", "Date", "y")) | |
####### end of setup############# | |
## define functions: | |
NSE_median_rows <- function(df, groupvar,x,nrows=NULL) { | |
#get the first rows for median calculations | |
MedianRows<- df %>% | |
dplyr::arrange_(.dots = lazyeval::lazy(x)) %>% | |
dplyr::group_by_(.dots = lazyeval::lazy(groupvar)) %>% | |
dplyr::slice_(~1:nrows) | |
return(MedianRows) | |
} | |
wrapr_median_rows <- function (dframe,datecol,groupvar=NULL,colname,nrows=9) { | |
mapping = list(COL=colname,DATES=datecol) | |
if(!is.null(groupvar)) { | |
wrapr::let(list(GROUPVAR= groupvar), | |
dframe %>% | |
dplyr::group_by(GROUPVAR)-> dframe | |
) | |
} | |
wrapr::let(mapping, | |
{ | |
dframe %>% | |
dplyr::arrange(DATES)%>% | |
dplyr::filter(row_number(DATES) %in% c(1:nrows)) %>% | |
#dplyr::mutate(baseline = median(COL))%>% | |
dplyr::ungroup() | |
}) | |
} | |
####compare use#### | |
#interactive dplyr: | |
interactive_data <- data %>% | |
arrange(Date) %>% | |
group_by(Location) %>% | |
filter(row_number(Location) %in% c(1:9)) %>% | |
ungroup() | |
#NSE/lazyeval: | |
NSE_data <- NSE_median_rows(data,Location,Date,9) | |
##wrapr let : | |
wrapr_let_data <- wrapr_median_rows(data,'Date','Location','y',9) | |
#compare | |
interactive_data | |
NSE_data | |
wrapr_let_data |
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