How to change line width in ggplot

Question

Datalink  the data used  My code   ccfsisims  lt - read csv file    F  Purdue University RA Position PhD ResearchandDissert PhD Draft GTAP-CGE GTAP NewAggDatabase NewFiles GTAP ConsIndex csv   header TRUE  sep      na string  NA   dec      strip white TRUE  ccfsirsts  lt - as data frame ccfsisims  ccfsirsts 6 24   lt - sapply ccfsirsts 6 24  as numeric  ccfsirsts  lt - droplevels ccfsirsts  ccfsirsts  lt - transform ccfsirsts sres factor sres levels unique sres     library ggplot2    ------------------------------------------------------------------------------------------      Plot of food security index for Morocco and Turkey by sector  ------------------------------------------------------------------------------------------    Code Begin     datamortur  lt - melt ccfsirsts ccfsirsts region  in  c  TUR   MAR         Selecting regions of interest datamortur1  lt - datamortur datamortur variable  in  c  pFSI2        Selecting the food security index of interest datamortur2  lt - datamortur1 datamortur1 sector  in  c  wht   gro   VegtFrut   osd   OthCrop   VegtOil   XPrFood        Selecting food sectors of interest datamortur3  lt - subset datamortur2  tradlib    BASEDATA     Eliminating the  BASEDATA  scenario results    allfsi f  lt - datamortur3 fsi wht  lt - allfsi f allfsi f sector  in  c  wht       Figure29  lt - ggplot data fsi wht  aes x factor sres  y value colour factor tradlib    Figure29   geom line aes group factor tradlib  size 2     facet grid regionsFull    scales  free y   labeller reg labeller    scale colour brewer type    div     theme axis text x   element text colour    black   angle   90  size   13  hjust   0 5  vjust   0 5  axis title x element blank       ylab  FSI   Change      theme axis text y   element text colour    black   size   12   axis title y   element text size   12  hjust   0 5  vjust   0 2      theme strip text y   element text size   11  hjust   0 5  vjust   0 5  face    bold      My result     Newresult with aes size 2     My question  Is there a way to control for line width more precisely to avoid the result in the second plot  I particularly find it document-unfriendly  and more so for publishing purposes to include the plot with the newly defined line width   best  ismail

User · Answer

Line width in ggplot2 can be changed with argument size  in geom line      sample data df lt -data frame x rnorm 100  y rnorm 100   ggplot df aes x x y y   geom line size 2

User · Answer

Line width in ggplot2 can be changed with argument lwd  in geom line     geom line aes x      y      color       lwd 1 5

User · Answer

Whilst  Didzis has the correct answer  I will expand on a few points  Aesthetics can be set or mapped within a ggplot call    An aesthetic defined within aes      is mapped from the data  and a legend created  An aesthetic may also be set to a single value  by defining it outside aes      As far as I can tell  what you want is to set size to a single value  not map within the call to aes    When you call aes size   2  it creates a variable called  2  and uses that to create the size  mapping it from a constant value as it is within a call to aes  thus it appears in your legend    Using size   1  and without reg labeller which is perhaps defined somewhere in your script   Figure29       geom line aes group factor tradlib   size 1        facet grid regionsFull    scales  free y         scale colour brewer type    div         theme axis text x   element text            colour    black   angle   90  size   13            hjust   0 5  vjust   0 5  axis title x element blank          ylab  FSI   Change          theme axis text y   element text colour    black   size   12              axis title y   element text size   12             hjust   0 5  vjust   0 2          theme strip text y   element text size   11  hjust   0 5            vjust      0 5  face    bold        and with size   2   Figure29         geom line aes group factor tradlib   size 2         facet grid regionsFull    scales  free y           scale colour brewer type    div          theme axis text x   element text colour    black   angle   90            size   13  hjust   0 5  vjust              0 5  axis title x element blank            ylab  FSI   Change           theme axis text y   element text colour    black   size   12             axis title y   element text size   12            hjust   0 5  vjust   0 2            theme strip text y   element text size   11  hjust   0 5            vjust   0 5  face    bold        You can now define the size to work appropriately with the final image size and device type

User · Answer

It also looks like if you just put the size argument in the geom line   portion but without the aes   it will scale appropriately  At least it works this way with geom density and I had the same problem

User · Answer

If you want to modify the line width flexibly you can use  scale size manual   this is the same procedure for picking the color  fill  alpha  etc   library ggplot2  library tidyr   x   seq 0 10 0 05   df  lt - data frame A   2   x   10                   B   x  2 - x 6                   C   30 - x  1 5                   X   x    df   gather df A B C key  Model  value  Y     ggplot  df  aes  x X  y Y  size Model  colour Model       geom line      scale size manual  values   c 4 2 1        scale color manual  values   c  orange   red   navy

[r] How to change line width in ggplot?

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