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Manually inserting an extra tick on the y axis in ggplot2

5 messages · KMNanus, Rolf Turner, John Kane

Original
KMNanus
# 
I have called geom_hline to insert a horizontal line on the y axis of a plot at a given point.

How can I insert the corresponding tick and its value on the y axis itself?

Ken
kmnanus at gmail.com
914-450-0816 (tel)
347-730-4813 (fax)
John Kane
# 
You might abe able to do it by using scale_y_continuous() but it would be a great help to see some (minimal) code and some sample data.

Please have a look at
http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example and/or http://adv-r.had.co.nz/Reproducibility.html

Re  scale_y_continuous() have a look at http://stackoverflow.com/questions/22228696/specify-tick-marks-on-y-axis-ggplot2 which might suggest some approaches.

John Kane
Kingston ON Canada
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Rolf Turner
#
On 26/03/16 03:07, KMNanus wrote:
I think that axis() is what you need, but it's hard to tell without a 
reproducible example.

cheers,

Rolf Turner
KMNanus
# 
Thanks.  Actually, found a good answer online - 

I wanted a horizontal line with a y intercept of 12.6.

I set m <- 12.6

I drew the line with geom_hline then added geom_text(aes(0,m,label = m, vjust = -1))

which worked just fine.  

Ken
kmnanus at gmail.com
914-450-0816 (tel)
347-730-4813 (fax)
John Kane
# 
?Oh yes, looks good. 

I misread your request and thought that you wanted it integrated with the labels on the y-axis.

John Kane
Kingston ON Canada

-----Original Message-----
From: kmnanus at gmail.com
Sent: Fri, 25 Mar 2016 18:16:21 -0400
To: jrkrideau at inbox.com
Subject: Re: [R] Manually inserting an extra tick on the y axis in ggplot2

Thanks. ?Actually, found a good answer online -?

I wanted a horizontal line with a y intercept of 12.6.

I set m <- 12.6

I drew the line with geom_hline then added?geom_text(aes(0,m,label =?m, vjust = -1))

which worked just fine. ?

 Ken
kmnanus at gmail.com
914-450-0816 (tel)
347-730-4813 (fax)
On Mar 25, 2016, at 5:15 PM, John Kane <jrkrideau at inbox.com> wrote:
You might abe able to do it by using scale_y_continuous() but it would be a great help to see some (minimal) code and some sample data.

Please have a look at
http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example [http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example] and/or http://adv-r.had.co.nz/Reproducibility.html [http://adv-r.had.co.nz/Reproducibility.html]

Re ?scale_y_continuous() have a look at http://stackoverflow.com/questions/22228696/specify-tick-marks-on-y-axis-ggplot2 [http://stackoverflow.com/questions/22228696/specify-tick-marks-on-y-axis-ggplot2] which might suggest some approaches.

John Kane
Kingston ON Canada

	-----Original Message-----
From: kmnanus at gmail.com
Sent: Fri, 25 Mar 2016 10:07:10 -0400
To: r-help at r-project.org
Subject: [R] Manually inserting an extra tick on the y axis in ggplot2

I have called geom_hline to insert a horizontal line on the y axis of a
plot at a given point.

How can I insert the corresponding tick and its value on the y axis
itself?

Ken
kmnanus at gmail.com
914-450-0816 (tel)
347-730-4813 (fax)

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