How to specify a certain csv in the errorbar line - r

Question

I am trying to make a plot with three different csvs. In 2 of them, the columns are the same i.e. Year, GMSL and GMSLerror.
In the Frederikse file the columns are Year, GMSL, GMSLerrorlow and GMSLerrorup. How can I tell R to plot the Frederikse error using the columns GMSLerrorlow and GMSLerrorup? I tried the following but it did not work. Thanks.
p1<-files <- c("Frederikse.csv", "ChurchandWhite.csv","Hay.csv")
map_dfr(files, ~ read_csv(.x) %>%
mutate(Author = .x)) %>%
ggplot(aes(x = Time, y = GMSL, color = Author,fill=Author)) +
geom_line(size=0.6)+
theme_bw(12)+
theme(panel.grid.major = element_blank())+
theme(panel.grid.minor = element_blank())+
labs(x = "Year", y = "GMSL (mm)",color="Author")+
geom_errorbar(aes(ymin=GMSL-GMSLerror, ymax =GMSL+GMSLerror,alpha=Author))+
geom_errorbar("Frederikse.csv",(aes(ymin=GMSL-GMSLerrorlow, ymax =GMSL+GMSLerrorup,alpha=Author)))
scale_alpha_manual(values = c(0.3, 0.3, 0.8))+
scale_colour_manual(values=c("#BAB3F0","#1D3E72","#201641"))
p1
structure(list(Year = 1900:1905, GMSLerrorlow = c(-203.5572666,
-201.0185091, -212.0740442, -202.6975639, -200.1670151, -192.1312551
), GMSL = c(-173.2614421, -168.8016753, -180.389967, -170.2678322,
-168.7200709, -160.9814287), GMSLerrorup = c(-141.002807, -135.8976091,
-148.213824, -138.9305182, -137.4501224, -130.3514508)), row.names = c(NA,
6L), class = "data.frame")
structure(list(Time = 1900:1905, GMSL = c(-131.15, -130.5, -129.77,
-128.85, -128.1, -127.56), GMSLerror = c(25.32, 25.17, 25.01,
24.86, 24.7, 24.55)), row.names = c(NA, 6L), class = "data.frame")
structure(list(Time = c(1880.0417, 1880.125, 1880.2083, 1880.2917,
1880.375, 1880.4583), GMSL = c(-183, -171.1, -164.3, -158.2,
-158.7, -159.6), GMSLerror = c(24.2, 24.2, 24.2, 24.2, 24.2,
24.2)), row.names = c(NA, 6L), class = "data.frame")````

Answer 1

You can do this with mutate to make GMSLerrorlow column for all datasets
p1<-files <- c("Frederikse.csv", "ChurchandWhite.csv","Hay.csv")
set_names(files) %>% # give names - can use str_remove to drop `.csv` from names
map_dfr( ~ read_csv(.x), .id = "Author") %>% #use .id argument
mutate(
GMSLerrorlow = if_else(Author != "Frederikse.csv", GMSLerror, GMSLerrorlow),
GMSLerrorup = if_else(Author != "Frederikse.csv", GMSLerror, GMSLerrorup)
) %>%
ggplot(aes(x = Time, y = GMSL, color = Author,fill=Author)) +
geom_line(size=0.6)+
theme_bw(12)+
theme(panel.grid.major = element_blank())+
theme(panel.grid.minor = element_blank())+
labs(x = "Year", y = "GMSL (mm)",color="Author")+
geom_errorbar(aes(ymin=GMSL-GMSLerrorlow, ymax =GMSL+GMSLerrorup,alpha=Author))+
scale_alpha_manual(values = c(0.3, 0.3, 0.8))+
scale_colour_manual(values=c("#BAB3F0","#1D3E72","#201641"))