legend order in ggplot2

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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- 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?.

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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

p2

and 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?.

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intended only for its intended recipients.
If you received this e-mail by mistake, please immediately inform its
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The sender of this e-mail shall not be liable for any possible damage
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email.

In case that this e-mail forms part of business dealings:
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- if the e-mail contains an offer, the recipient is entitled to
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upon an express mutual agreement on all its aspects.
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Hi.

I dunno what you are doing wrong.

After that

library(ggplot2)
df<-data.frame(x1=c(1,2), y1=c(3,4),z1=c(5,6),w1=c(7,8))
library(reshape2)
dfm<-melt(df)

No id variables; using all as measure variables

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"))

I get enclosed picture. I am on W10 but R should more or less provide same result on either platform.

Cheers
Petr

Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a podl?haj? tomuto pr?vn? z?vazn?mu prohl??en? o vylou?en? odpov?dnosti: https://www.precheza.cz/01-dovetek/ | This email and any documents attached to it may be confidential and are subject to the legally binding disclaimer: https://www.precheza.cz/en/01-disclaimer/

From: John [mailto:miaojpm at gmail.com]
Sent: Wednesday, May 23, 2018 3:25 AM
To: PIKAL Petr <petr.pikal at precheza.cz>
Cc: r-help <r-help at r-project.org>
Subject: Re: [R] legend order in ggplot2

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

p2

and 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<mailto: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<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<mailto: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<mailto: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.
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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?:
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- 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.
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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.

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- 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.


________________________________
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.
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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"))
###########

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