Hi,
I'd like to graph three lines on ggplot2 and I intend the lines to be
"solid", "dashed", and "dotted". The legend names
are "name_b", "name_a",
"name_c". I'd like to legend to present in the order: the
"name_b" at the
top, and "name_c" at the bottom.
As a consequence, the legend is indeed in the order: name_b at the top and
name_c at the bottom. However, I'd like name_b to corresponds to
"solid",
while it corresponds to "dashed", etc, which I don't want. How
could I make
"solid" correspond to "name_b"? Thanks,
#########
library(ggplot2)
df<-data.frame(x1=c(1,2), y1=c(3,4),z1=c(5,6),w1=c(7,8))
p1<-ggplot(df, aes(x=1:2, y=x1))+
geom_line(aes(linetype="name_b"))+
geom_line(aes(x=1:2, y=y1, linetype="name_a"), df)+
geom_line(aes(x=1:2, y=z1, linetype="name_c"), df)+
scale_linetype_manual(name="",
values=c("solid","dashed", "dotted"),
breaks=c("name_b","name_a","name_c"))
###########
[[alternative HTML version deleted]]
Hi
Your approach seems to me rather complicated. I would reshape data before
plotting and maybe also change order of levels in resulting variable factor
library(reshape2)
dfm<-melt(df)
dfm$variable<-factor(dfm$variable, levels=levels(dfm$variable)[c(2,1,3,4)])
p2<-ggplot(dfm, aes(x=rep(1:2,4), y=value))
p2+geom_line(aes(linetype=variable))+
scale_linetype_manual(values=c("solid", "dashed",
"dotted", "blank"),
labels=c("name_b","name_a","name_c",
"other"))
Cheers
Petr
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of John
> Sent: Tuesday, May 22, 2018 5:17 AM
> To: r-help <r-help at r-project.org>
> Subject: [R] legend order in ggplot2
>
> Hi,
>
> I'd like to graph three lines on ggplot2 and I intend the lines to
be "solid",
> "dashed", and "dotted". The legend names are
"name_b", "name_a",
> "name_c". I'd like to legend to present in the order: the
"name_b" at the top,
> and "name_c" at the bottom.
> As a consequence, the legend is indeed in the order: name_b at the top and
> name_c at the bottom. However, I'd like name_b to corresponds to
"solid",
> while it corresponds to "dashed", etc, which I don't want.
How could I make
> "solid" correspond to "name_b"? Thanks,
>
> #########
>
> library(ggplot2)
> df<-data.frame(x1=c(1,2), y1=c(3,4),z1=c(5,6),w1=c(7,8))
p1<-ggplot(df,
> aes(x=1:2, y=x1))+
> geom_line(aes(linetype="name_b"))+
> geom_line(aes(x=1:2, y=y1, linetype="name_a"), df)+
> geom_line(aes(x=1:2, y=z1, linetype="name_c"), df)+
> scale_linetype_manual(name="",
values=c("solid","dashed", "dotted"),
> breaks=c("name_b","name_a","name_c"))
> ###########
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
________________________________
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Hi, I ran your code, but the results were not as expected. After I ran the code by "source", it return No id variables; using all as measure variables> p2and no line or legend is on the graph (as attached) Am I doing anything wrong? John library(ggplot2) library(reshape2) dfm<-melt(df) dfm$variable<-factor(dfm$variable, levels=levels(dfm$variable)[c(2,1,3,4)]) p2<-ggplot(dfm, aes(x=rep(1:2,4), y=value)) p2+geom_line(aes(linetype=variable))+ scale_linetype_manual(values=c("solid", "dashed", "dotted", "blank"), labels=c("name_b","name_a","name_c", "other")) 2018-05-22 15:15 GMT+08:00 PIKAL Petr <petr.pikal at precheza.cz>:> Hi > > Your approach seems to me rather complicated. I would reshape data before > plotting and maybe also change order of levels in resulting variable factor > > library(reshape2) > dfm<-melt(df) > dfm$variable<-factor(dfm$variable, levels=levels(dfm$variable)[c( > 2,1,3,4)]) > p2<-ggplot(dfm, aes(x=rep(1:2,4), y=value)) > p2+geom_line(aes(linetype=variable))+ > scale_linetype_manual(values=c("solid", "dashed", "dotted", "blank"), > labels=c("name_b","name_a","name_c", "other")) > > Cheers > Petr > > > -----Original Message----- > > From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of John > > Sent: Tuesday, May 22, 2018 5:17 AM > > To: r-help <r-help at r-project.org> > > Subject: [R] legend order in ggplot2 > > > > Hi, > > > > I'd like to graph three lines on ggplot2 and I intend the lines to be > "solid", > > "dashed", and "dotted". The legend names are "name_b", "name_a", > > "name_c". I'd like to legend to present in the order: the "name_b" at > the top, > > and "name_c" at the bottom. > > As a consequence, the legend is indeed in the order: name_b at the top > and > > name_c at the bottom. However, I'd like name_b to corresponds to "solid", > > while it corresponds to "dashed", etc, which I don't want. How could I > make > > "solid" correspond to "name_b"? Thanks, > > > > ######### > > > > library(ggplot2) > > df<-data.frame(x1=c(1,2), y1=c(3,4),z1=c(5,6),w1=c(7,8)) p1<-ggplot(df, > > aes(x=1:2, y=x1))+ > > geom_line(aes(linetype="name_b"))+ > > geom_line(aes(x=1:2, y=y1, linetype="name_a"), df)+ > > geom_line(aes(x=1:2, y=z1, linetype="name_c"), df)+ > > scale_linetype_manual(name="", values=c("solid","dashed", "dotted"), > > breaks=c("name_b","name_a","name_c")) > > ########### > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide http://www.R-project.org/ > posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. > > ________________________________ > Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a jsou > ur?eny pouze jeho adres?t?m. > Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav? > neprodlen? jeho odes?latele. Obsah tohoto emailu i s p??lohami a jeho kopie > vyma?te ze sv?ho syst?mu. > Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni tento email > jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat. > Odes?latel e-mailu neodpov?d? za eventu?ln? ?kodu zp?sobenou modifikacemi > ?i zpo?d?n?m p?enosu e-mailu. > > V p??pad?, ?e je tento e-mail sou??st? obchodn?ho jedn?n?: > - vyhrazuje si odes?latel pr?vo ukon?it kdykoliv jedn?n? o uzav?en? > smlouvy, a to z jak?hokoliv d?vodu i bez uveden? d?vodu. > - a obsahuje-li nab?dku, je adres?t opr?vn?n nab?dku bezodkladn? p?ijmout; > Odes?latel tohoto e-mailu (nab?dky) vylu?uje p?ijet? nab?dky ze strany > p??jemce s dodatkem ?i odchylkou. > - trv? odes?latel na tom, ?e p??slu?n? smlouva je uzav?ena teprve > v?slovn?m dosa?en?m shody na v?ech jej?ch n?le?itostech. > - odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za > spole?nost ??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn? zmocn?n > nebo p?semn? pov??en a takov? pov??en? nebo pln? moc byly adres?tovi tohoto > emailu p??padn? osob?, kterou adres?t zastupuje, p?edlo?eny nebo jejich > existence je adres?tovi ?i osob? j?m zastoupen? zn?m?. > > This e-mail and any documents attached to it may be confidential and are > intended only for its intended recipients. > If you received this e-mail by mistake, please immediately inform its > sender. Delete the contents of this e-mail with all attachments and its > copies from your system. > If you are not the intended recipient of this e-mail, you are not > authorized to use, disseminate, copy or disclose this e-mail in any manner. > The sender of this e-mail shall not be liable for any possible damage > caused by modifications of the e-mail or by delay with transfer of the > email. > > In case that this e-mail forms part of business dealings: > - the sender reserves the right to end negotiations about entering into a > contract in any time, for any reason, and without stating any reasoning. > - if the e-mail contains an offer, the recipient is entitled to > immediately accept such offer; The sender of this e-mail (offer) excludes > any acceptance of the offer on the part of the recipient containing any > amendment or variation. > - the sender insists on that the respective contract is concluded only > upon an express mutual agreement on all its aspects. > - the sender of this e-mail informs that he/she is not authorized to enter > into any contracts on behalf of the company except for cases in which > he/she is expressly authorized to do so in writing, and such authorization > or power of attorney is submitted to the recipient or the person > represented by the recipient, or the existence of such authorization is > known to the recipient of the person represented by the recipient. >-------------- next part -------------- A non-text attachment was scrubbed... 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John,
The order of legends in ggplot2 depends on the order of factor levels in the
data frame. The linetype can be matched to the factor levels using a named
vector (ggplot2 basically does a lookup).
The biggest problem you have here is that you?re not passing data in the right
form or format to ggplot2. ggplot2 expects a data frame in tidy format (see
http://r4ds.had.co.nz/tidy-data.html), and you?ve got wide (and pretty messy)
data.
To get this to work, your data frame needs to look like:
x var val
1 name_a 1
2 name_a 2
1 name_b 3
2 name_b 4
.
.
.
To make this work, I?m going to load tidyverse instead of just ggplot2. We?ll
start with your data, but we need to reshape it into tidy format using dplyr and
tidyr, and then we need to order the factor levels with forcats.
library(tidyverse)
my_df <- data_frame(x = c(1, 2),
name_a=c(1,2),
name_b=c(3,4),
name_c=c(5,6)) %>%
gather(var, val, -x) %>%
mutate(var = fct_relevel(var, "name_b", "name_a",
?name_c?))
Here?s how the data looks:
> my_df
# A tibble: 6 x 3
x var val
<dbl> <fct> <dbl>
1 1 name_a 1
2 2 name_a 2
3 1 name_b 3
4 2 name_b 4
5 1 name_c 5
6 2 name_c 6> levels(my_df$var)
[1] "name_b" "name_a" ?name_c"
Now we have the data in the right format, and your factors are in the right
order for the legend. We can quick test this:
ggplot(my_df, aes(x = x, y = val, linetype = var)) +
geom_line()
and I think this is pretty close to what you were looking for.
To control the linetype by factor level, we need to tell ggplot2 which linetype
goes with which factor level by using scale_linetype_manual():
my_lines <- c(name_a = "solid", name_b = "dotted", name_c
= "twodash")
ggplot(df, aes(x = x, y = val, linetype = var)) +
geom_line() +
scale_linetype_manual(values = my_lines)
Here, I?ve deliberately changed the linetypes so we can see that the code works
as desired. You?ll want to change the linetypes in my_lines to what you want.
Putting it all together:
library(tidyverse)
my_df <- data_frame(x = c(1, 2),
name_a=c(1,2),
name_b=c(3,4),
name_c=c(5,6)) %>%
gather(var, val, -x) %>%
mutate(var = fct_relevel(var, "name_b", "name_a",
"name_c?))
my_lines <- c(name_a = "solid", name_b = "dotted", name_c
= "twodash")
ggplot(my_df, aes(x = x, y = val, linetype = var)) +
geom_line() +
scale_linetype_manual(values = my_lines)
Regards,
Tom
> On 201805 21, at 23:16, John <miaojpm at gmail.com> wrote:
>
> Hi,
>
> I'd like to graph three lines on ggplot2 and I intend the lines to be
> "solid", "dashed", and "dotted". The legend
names are "name_b", "name_a",
> "name_c". I'd like to legend to present in the order: the
"name_b" at the
> top, and "name_c" at the bottom.
> As a consequence, the legend is indeed in the order: name_b at the top and
> name_c at the bottom. However, I'd like name_b to corresponds to
"solid",
> while it corresponds to "dashed", etc, which I don't want.
How could I make
> "solid" correspond to "name_b"? Thanks,
>
> #########
>
> library(ggplot2)
> df<-data.frame(x1=c(1,2), y1=c(3,4),z1=c(5,6),w1=c(7,8))
> p1<-ggplot(df, aes(x=1:2, y=x1))+
> geom_line(aes(linetype="name_b"))+
> geom_line(aes(x=1:2, y=y1, linetype="name_a"), df)+
> geom_line(aes(x=1:2, y=z1, linetype="name_c"), df)+
> scale_linetype_manual(name="",
values=c("solid","dashed", "dotted"),
> breaks=c("name_b","name_a","name_c"))
> ###########
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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