Rotating x axis labels in R for barplot

Question

I am trying to get the x axis labels to be rotated 45 degrees on a barplot with no luck  This is the code I have below   barplot   data1  1  - average  average    100          srt         45          adj         1          xpd         TRUE          names arg   data1  2           col         c   3CA0D0            main         Best Lift Time to Vertical Drop Ratios of North American Resorts           ylab         Normalized Difference           yaxt         n           cex names   0 65          cex lab     0 65

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You can use ggplot2 to rotate the x-axis label adding an additional layer  theme axis text x   element text angle   90  hjust   1

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Rotate the x axis labels with angle equal or smaller than 90 degrees using base graphics  Code adapted from the R FAQ   par mar   c 7  4  2  2    0 2   add room for the rotated labels   use mtcars dataset to produce a barplot with qsec colum information mtcars   mtcars with mtcars  order -qsec       order mtcars data set by column  qsec   end point   0 5   nrow mtcars    nrow mtcars  - 1  this is the line which does the trick  together with barplot  space   1  parameter   barplot mtcars qsec  col    grey50            main               ylab    mtcars - qsec   ylim   c 0 5   max mtcars qsec            xlab               space   1   rotate 60 degrees  srt   60  text seq 1 5  end point  by   2   par  usr   3 -0 25        srt   60  adj   1  xpd   TRUE       labels   paste rownames mtcars    cex   0 65

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You may use  par las 2    make label text perpendicular to axis   It is written here  http   www statmethods net graphs bar html

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EDITED ANSWER PER DAVID S RESPONSE   Here s a kind of hackish way   I m guessing there s an easier way   But you could suppress the bar labels and the plot text of the labels by saving the bar positions from barplot and do a little tweaking up and down   Here s an example with the mtcars data set   x  lt - barplot table mtcars cyl   xaxt  n   labs  lt - paste names table mtcars cyl     cylinders   text cex 1  x x- 25  y -1 25  labs  xpd TRUE  srt 45

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In the documentation of Bar Plots we can read about the additional parameters       which can be passed to the function call          arguments to be passed to from other methods  For the default method these can         include further arguments  such as axes  asp and main  and graphical         parameters  see par  which are passed to plot window    title   and axis    In the documentation of graphical parameters  documentation of par  we can see   las     numeric in  0 1 2 3   the style of axis labels       0        always parallel to the axis  default        1        always horizontal       2        always perpendicular to the axis       3        always vertical       Also supported by mtext  Note that string character rotation via argument srt to par does not affect the axis labels    That is why passing las 2 is the right answer

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You can simply pass your data frame into the following function   rotate x  lt - function data  column to plot  labels vec  rot angle        plt  lt - barplot data  column to plot    col  steelblue   xaxt  n       text plt  par  usr   3   labels   labels vec  srt   rot angle  adj   c 1 1 1 1   xpd   TRUE  cex 0 6       Usage   rotate x mtcars   mpg   row names mtcars   45      You can change the rotation angle of the labels as needed

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Andre Silva s answer works great for me  with one caveat in the  barplot  line   barplot mtcars qsec  col  grey50        main         ylab  mtcars - qsec   ylim c 0 5 max mtcars qsec        xlab           xaxt    n        space 1    Notice the  xaxt  argument  Without it  the labels are drawn twice  the first time without the 60 degree rotation

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use optional parameter las 2    barplot mytable main  Car makes  ylab  Freqency  xlab  make  las 2

[r] Rotating x axis labels in R for barplot

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