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

[Bert Gunter]

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 using 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
>
>
>
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>

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