Change the spacing of tick marks on the axis of a plot?

by

There are at least two ways for achieving this in base graph (my examples are for the x-axis, but work the same for the y-axis):

  1. Use par(xaxp = c(x1, x2, n)) or plot(..., xaxp = c(x1, x2, n)) to define the position (x1 & x2) of the extreme tick marks and the number of intervals between the tick marks (n). Accordingly, n+1 is the number of tick marks drawn. (This works only if you use no logarithmic scale, for the behavior with logarithmic scales see ?par.)

  2. You can suppress the drawing of the axis altogether and add the tick marks later with axis().
    To suppress the drawing of the axis use plot(... , xaxt = "n").
    Then call axis() with side, at, and labels: axis(side = 1, at = v1, labels = v2). With side referring to the side of the axis (1 = x-axis, 2 = y-axis), v1 being a vector containing the position of the ticks (e.g., c(1, 3, 5) if your axis ranges from 0 to 6 and you want three marks), and v2 a vector containing the labels for the specified tick marks (must be of same length as v1, e.g., c("group a", "group b", "group c")). See ?axis and my updated answer to a post on stats.stackexchange for an example of this method.

More Related Contents:

  1. How to save a plot as image on the disk?
  2. Plot two graphs in same plot in R
  3. Shading a kernel density plot between two points.
  4. Force the origin to start at 0
  5. Plot multiple boxplot in one graph
  6. Replace X-axis with own values
  7. How to set multiple legends / scales for the same aesthetic in ggplot2?
  8. Getting LaTeX into R Plots
  9. How to overlay density plots in R?
  10. Difference between passing options in aes() and outside of it in ggplot2
  11. Use stat_summary to annotate plot with number of observations
  12. Plotting a 3D surface plot with contour map overlay, using R
  13. Speed up plot() function for large dataset
  14. ggplot2: How to specify multiple fill colors for points that are connected by lines of different colors
  15. Colour points in a plot differently depending on a vector of values
  16. Insert blanks into a vector for, e.g., minor tick labels in R
  17. Getting a stacked area plot in R
  18. Error in plot.window(…) : need finite ‘xlim’ values
  19. Is it possible to rotate a plot in R (base graphics)?
  20. How to combine 2 plots (ggplot) into one plot?
  21. plot.new has not been called yet
  22. add text to horizontal barplot in R, y-axis at different scale?
  23. How to fit a smooth curve to my data in R?
  24. Messy plot when plotting predictions of a polynomial regression using lm() in R
  25. Avoid wasting space when placing multiple aligned plots onto one page
  26. lower and upper quartiles in boxplot in R
  27. Add raster to ggmap base map: set alpha (transparency) and fill color to inset_raster() in ggplot2
  28. Creating a vertical color gradient for a geom_bar plot
  29. heatmap-like plot, but for categorical variables
  30. In ggplot2, coord_flip and free scales don’t work together

Leave a Comment