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Sorkin, John

2025-Jan-21 02:18 UTC

[R] ggplot with major and MINOR tick marks on a log scale

I have used ggplot to create a graph on which the y-axis is on the log scale.
(see data and code, below.) I would like to add minor tick marks, which will
also be on the log scale. The data and code are below. I hope somone can tell me
how I can modify the ggplot code so it produces minor tick marks on a log scale.
Thank you,
John
?
PopByDayByAQIminus <- dget(
  structure(list(Day = c("25", "25", "25",
"25", "25", "25", "25",
         "26", "26", "26", "26",
"26", "26", "26", "27", "27",
"27", "27",
         "27", "27", "27", "28",
"28", "28", "28", "28", "28",
"28"),
         AQI_Cat = structure(c(1L, 2L, 3L, 4L, 5L, 6L, 7L, 1L, 2L, 
               3L, 4L, 5L, 6L, 7L, 1L, 2L, 3L, 4L, 5L, 6L, 7L, 1L, 2L, 3L, 
               4L, 5L, 6L, 7L), levels = c("Good",
"Moderate", "Unhealthy For Some",
                 "Unhealthy", "Very Unhealthy",
"Hazardous1", "Hazardous2"),
         class = "factor"), TotalPop = c(3751359, 35043, 4285, 
                 11581, 26241, 17456, 18406, 3654557, 153002, 29954, 8452, 
                  7719, 10687, 10430, 3654344, 104843, 57277, 24910, 15165, 
                  4680, 13582, 3116416, 516504, 149029, 29640, 33468, 10862, 
                  18882)), 
         class = "data.frame", row.names = c(NA, -28L)))

PopByDayByAQIminus

ggplot(PopByDayByAQIminus,aes(x=AQI_Cat,y=TotalPop/1000000,
                                       
group=Day,color=Day,shape=factor(Day),linetype = factor(Day)))+
  labs(title=title,x="Air Quality Index") +
  geom_point(size=4,alpha=0.7)+
  geom_line(linewidth=1.5,alpha=0.3)+
  theme(axis.text.x=element_text(angle = -15, hjust = 0))+
  scale_y_continuous(trans='log10')
scale_y_continuous(breaks=seq(0,4000000,by=1000000))





John David Sorkin M.D., Ph.D.
Professor of Medicine, University of Maryland School of Medicine;
Associate Director for Biostatistics and Informatics, Baltimore VA Medical
Center Geriatrics Research, Education, and Clinical Center;?
PI?Biostatistics and Informatics Core, University of Maryland School of Medicine
Claude D. Pepper Older Americans Independence Center;
Senior Statistician University of Maryland Center for Vascular Research;

Division of Gerontology and Paliative Care,
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
Cell phone 443-418-5382

Bert Gunter

2025-Jan-21 02:58 UTC

head link

[R] ggplot with major and MINOR tick marks on a log scale

dget() should be dput(), of course. But you don't need dput() either, as
assigning the structure() call suffices.

-- Bert

On Mon, Jan 20, 2025 at 6:18?PM Sorkin, John <jsorkin at
som.umaryland.edu>
wrote:
> I have used ggplot to create a graph on which the y-axis is on the log
> scale. (see data and code, below.) I would like to add minor tick marks,
> which will also be on the log scale. The data and code are below. I hope
> somone can tell me how I can modify the ggplot code so it produces minor
> tick marks on a log scale.
> Thank you,
> John
>
> PopByDayByAQIminus <- dget(
>   structure(list(Day = c("25", "25", "25",
"25", "25", "25", "25",
>          "26", "26", "26", "26",
"26", "26", "26", "27", "27",
"27", "27",
>          "27", "27", "27", "28",
"28", "28", "28", "28", "28",
"28"),
>          AQI_Cat = structure(c(1L, 2L, 3L, 4L, 5L, 6L, 7L, 1L, 2L,
>                3L, 4L, 5L, 6L, 7L, 1L, 2L, 3L, 4L, 5L, 6L, 7L, 1L, 2L, 3L,
>                4L, 5L, 6L, 7L), levels = c("Good",
"Moderate", "Unhealthy
> For Some",
>                  "Unhealthy", "Very Unhealthy",
"Hazardous1",
> "Hazardous2"),
>          class = "factor"), TotalPop = c(3751359, 35043, 4285,
>                  11581, 26241, 17456, 18406, 3654557, 153002, 29954, 8452,
>                   7719, 10687, 10430, 3654344, 104843, 57277, 24910,
> 15165,
>                   4680, 13582, 3116416, 516504, 149029, 29640, 33468,
> 10862,
>                   18882)),
>          class = "data.frame", row.names = c(NA, -28L)))
>
> PopByDayByAQIminus
>
> ggplot(PopByDayByAQIminus,aes(x=AQI_Cat,y=TotalPop/1000000,
>
> group=Day,color=Day,shape=factor(Day),linetype = factor(Day)))+
>   labs(title=title,x="Air Quality Index") +
>   geom_point(size=4,alpha=0.7)+
>   geom_line(linewidth=1.5,alpha=0.3)+
>   theme(axis.text.x=element_text(angle = -15, hjust = 0))+
>   scale_y_continuous(trans='log10')
> scale_y_continuous(breaks=seq(0,4000000,by=1000000))
>
>
>
>
>
> John David Sorkin M.D., Ph.D.
> Professor of Medicine, University of Maryland School of Medicine;
> Associate Director for Biostatistics and Informatics, Baltimore VA Medical
> Center Geriatrics Research, Education, and Clinical Center;
> PI Biostatistics and Informatics Core, University of Maryland School of
> Medicine Claude D. Pepper Older Americans Independence Center;
> Senior Statistician University of Maryland Center for Vascular Research;
>
> Division of Gerontology and Paliative Care,
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
> Cell phone 443-418-5382
>
>
>
> ______________________________________________
> 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
> https://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
	[[alternative HTML version deleted]]

Kimmo Elo

2025-Jan-21 07:07 UTC

head link

[R] ggplot with major and MINOR tick marks on a log scale

Hi,

this code could/should work:

--- snip ---

PopByDayByAQIminus %>%
    ggplot(aes(x=AQI_Cat,y=TotalPop/1000000),
           group=Day,color=Day,shape=as_factor(Day),
           linetype = as_factor(Day)) +
    geom_point(size=4,alpha=0.7)+
    geom_line(linewidth=1.5,alpha=0.3)+
    theme(axis.text.x=element_text(angle = -15, hjust = 0))+
    scale_y_log10(guide="axis_logticks")

--- snip ---

I had to remove the labs-line, because the variable "title" was
unknown
to my R :-)

See also:
https://ggplot2.tidyverse.org/reference/guide_axis_logticks.html

Best,

Kimmo

ti, 2025-01-21 kello 02:18 +0000, Sorkin, John
kirjoitti:> I have used ggplot to create a graph on which the y-axis is on the
> log scale. (see data and code, below.) I would like to add minor tick
> marks, which will also be on the log scale. The data and code are
> below. I hope somone can tell me how I can modify the ggplot code so
> it produces minor tick marks on a log scale.
> Thank you,
> John
>
> PopByDayByAQIminus <- dget(
>   structure(list(Day = c("25", "25", "25",
"25", "25", "25", "25",
>          "26", "26", "26", "26",
"26", "26", "26", "27", "27",
"27",
> "27",
>          "27", "27", "27", "28",
"28", "28", "28", "28", "28",
"28"),
>          AQI_Cat = structure(c(1L, 2L, 3L, 4L, 5L, 6L, 7L, 1L, 2L,
>                3L, 4L, 5L, 6L, 7L, 1L, 2L, 3L, 4L, 5L, 6L, 7L, 1L,
> 2L, 3L,
>                4L, 5L, 6L, 7L), levels = c("Good",
"Moderate",
> "Unhealthy For Some",
>                  "Unhealthy", "Very Unhealthy",
"Hazardous1",
> "Hazardous2"),
>          class = "factor"), TotalPop = c(3751359, 35043, 4285,
>                  11581, 26241, 17456, 18406, 3654557, 153002, 29954,
> 8452,
>                   7719, 10687, 10430, 3654344, 104843, 57277, 24910,
> 15165,
>                   4680, 13582, 3116416, 516504, 149029, 29640, 33468,
> 10862,
>                   18882)),
>          class = "data.frame", row.names = c(NA, -28L)))
>
> PopByDayByAQIminus
>
> ggplot(PopByDayByAQIminus,aes(x=AQI_Cat,y=TotalPop/1000000,
>
> group=Day,color=Day,shape=factor(Day),linetype = factor(Day)))+
>   labs(title=title,x="Air Quality Index") +
>   geom_point(size=4,alpha=0.7)+
>   geom_line(linewidth=1.5,alpha=0.3)+
>   theme(axis.text.x=element_text(angle = -15, hjust = 0))+
>   scale_y_continuous(trans='log10')
> scale_y_continuous(breaks=seq(0,4000000,by=1000000))
>
>
>
>
>
> John David Sorkin M.D., Ph.D.
> Professor of Medicine, University of Maryland School of Medicine;
> Associate Director for Biostatistics and Informatics, Baltimore VA
> Medical Center Geriatrics Research, Education, and Clinical Center;
> PI Biostatistics and Informatics Core, University of Maryland School
> of Medicine Claude D. Pepper Older Americans Independence Center;
> Senior Statistician University of Maryland Center for Vascular
> Research;
>
> Division of Gerontology and Paliative Care,
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
> Cell phone 443-418-5382
>
>
>
> ______________________________________________
> 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
> https://www.r-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

Rui Barradas

2025-Jan-21 19:38 UTC

head link

[R] ggplot with major and MINOR tick marks on a log scale

?s 02:18 de 21/01/2025, Sorkin, John escreveu:> I have used ggplot to create a graph on which the y-axis is on the log
scale. (see data and code, below.) I would like to add minor tick marks, which
will also be on the log scale. The data and code are below. I hope somone can
tell me how I can modify the ggplot code so it produces minor tick marks on a
log scale.
> Thank you,
> John
>   
> PopByDayByAQIminus <- dget(
>    structure(list(Day = c("25", "25", "25",
"25", "25", "25", "25",
>           "26", "26", "26", "26",
"26", "26", "26", "27", "27",
"27", "27",
>           "27", "27", "27", "28",
"28", "28", "28", "28", "28",
"28"),
>           AQI_Cat = structure(c(1L, 2L, 3L, 4L, 5L, 6L, 7L, 1L, 2L,
>                 3L, 4L, 5L, 6L, 7L, 1L, 2L, 3L, 4L, 5L, 6L, 7L, 1L, 2L, 3L,
>                 4L, 5L, 6L, 7L), levels = c("Good",
"Moderate", "Unhealthy For Some",
>                   "Unhealthy", "Very Unhealthy",
"Hazardous1", "Hazardous2"),
>           class = "factor"), TotalPop = c(3751359, 35043, 4285,
>                   11581, 26241, 17456, 18406, 3654557, 153002, 29954, 8452,
>                    7719, 10687, 10430, 3654344, 104843, 57277, 24910,
15165,
>                    4680, 13582, 3116416, 516504, 149029, 29640, 33468,
10862,
>                    18882)),
>           class = "data.frame", row.names = c(NA, -28L)))
> 
> PopByDayByAQIminus
> 
> ggplot(PopByDayByAQIminus,aes(x=AQI_Cat,y=TotalPop/1000000,
>                                         
group=Day,color=Day,shape=factor(Day),linetype = factor(Day)))+
>    labs(title=title,x="Air Quality Index") +
>    geom_point(size=4,alpha=0.7)+
>    geom_line(linewidth=1.5,alpha=0.3)+
>    theme(axis.text.x=element_text(angle = -15, hjust = 0))+
>    scale_y_continuous(trans='log10')
> scale_y_continuous(breaks=seq(0,4000000,by=1000000))
> 
> 
> 
> 
> 
> John David Sorkin M.D., Ph.D.
> Professor of Medicine, University of Maryland School of Medicine;
> Associate Director for Biostatistics and Informatics, Baltimore VA Medical
Center Geriatrics Research, Education, and Clinical Center;
> PI?Biostatistics and Informatics Core, University of Maryland School of
Medicine Claude D. Pepper Older Americans Independence Center;
> Senior Statistician University of Maryland Center for Vascular Research;
> 
> Division of Gerontology and Paliative Care,
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
> Cell phone 443-418-5382
> 
> 
> 
> ______________________________________________
> 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
https://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.Hello,

Here are two plots with y axis minor breaks tick marks.
They both use guide_axis(minor.ticks = TRUE) but the 2nd plot spaces the 
tick marks as in logarithmic paper with an auxiliary function taken from 
a StackOverflow post.

Also, instead of scale_y_continuous(trans = "log10") I have used the 
equivalent scale_y_log10(), it makes the code simpler and the effect is 
exactly the same. From ?scale_y_continuous:

"There are three variants that set the transform argument for commonly 
used transformations: ?scale_*_log10()?, ?scale_*_sqrt()? and 
?scale_*_reverse()?."


Now the code.



PopByDayByAQIminus %>%
   mutate(Day = factor(Day)) %>%
   ggplot(
     aes(x = AQI_Cat, y = TotalPop/1000000,
         group = Day,
         color = Day,
         shape = Day,
         linetype = Day)) +
   labs(x = "Air Quality Index") +
   geom_point(size = 4,alpha = 0.7) +
   geom_line(linewidth = 1.5, alpha = 0.3) +
   theme(axis.text.x = element_text(angle = -15, hjust = 0)) +
   scale_y_log10() +
   guides(y = guide_axis(minor.ticks = TRUE))

#--- And the other plot

# function in this StackOverflow post
# https://stackoverflow.com/a/33179099/8245406
log10_minor_break = function (...){
   function(x) {
     minx         = floor(min(log10(x), na.rm=TRUE)) - 1
     maxx         = ceiling(max(log10(x), na.rm=TRUE)) + 1
     n_major      = maxx - minx + 1
     major_breaks = seq(minx, maxx, by = 1)
     minor_breaks        rep(log10(seq(1, 9, by=1)), times = n_major) +
       rep(major_breaks, each = 9)
     return(10^(minor_breaks))
   }
}

PopByDayByAQIminus %>%
   mutate(Day = factor(Day)) %>%
   ggplot(
     aes(x = AQI_Cat, y = TotalPop/1000000,
         group = Day,
         color = Day,
         shape = Day,
         linetype = Day)) +
   labs(x = "Air Quality Index") +
   geom_point(size = 4,alpha = 0.7) +
   geom_line(linewidth = 1.5, alpha = 0.3) +
   theme(axis.text.x = element_text(angle = -15, hjust = 0)) +
   scale_y_log10(
     minor_breaks = log10_minor_break()
   ) +
   guides(y = guide_axis(minor.ticks = TRUE))


Hope this helps,

Rui Barradas

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