adding x and y axis labels in ggplot2

Question

How do I change the x and y labels on this graph please   library Sleuth2  library ggplot2  discharge lt -ex1221new Discharge area lt -ex1221new Area nitrogen lt -ex1221new NO3 p  lt - ggplot ex1221new  aes discharge  area   main  Point   p   geom point aes size  nitrogen          scale area          opts title   expression  Weighted Scatterplot of Watershed Area vs  Discharge and Nitrogen Levels  PPM               subtitle  n 41

User · Accepted Answer

Note  edited to modernize ggplot syntax   Your example is not reproducible since there is no ex1221new  there is an ex1221 in Sleuth2  so I guess that is what you meant   Also  you don t need  and shouldn t  pull columns out to send to ggplot  One advantage is that ggplot works with data frames directly   You can set the labels with xlab   and ylab    or make it part of the scale     call   library  Sleuth2   library  ggplot2   ggplot ex1221  aes Discharge  Area       geom point aes size NO3        scale size area        xlab  My x label       ylab  My y label       ggtitle  Weighted Scatterplot of Watershed Area vs  Discharge and Nitrogen Levels  PPM        ggplot ex1221  aes Discharge  Area       geom point aes size NO3        scale size area  Nitrogen        scale x continuous  My x label       scale y continuous  My y label       ggtitle  Weighted Scatterplot of Watershed Area vs  Discharge and Nitrogen Levels  PPM        An alternate way to specify just labels  handy if you are not changing any other aspects of the scales  is using the labs function  ggplot ex1221  aes Discharge  Area       geom point aes size NO3        scale size area        labs size   Nitrogen          x    My x label          y    My y label          title    Weighted Scatterplot of Watershed Area vs  Discharge and Nitrogen Levels  PPM      which gives an identical figure to the one above

User · Answer

since the data ex1221new was not given  so I have created a dummy data and added it to a data frame  Also  the question which was asked has few changes in codes  like then ggplot package has deprecated the use of  quot scale area   quot  and nows uses scale size area    quot opts   quot  has changed to theme    In my answer I have stored the plot in mygraph variable and then I have used mygraph labels x  quot Discharge of materials quot   changes x axis title        mygraph labels y  quot Area Affected quot    changes y axis title  And the work is done  Below is the complete answer  install packages  quot Sleuth2 quot   library Sleuth2  library ggplot2   ex1221new lt -data frame Discharge lt -c 100 109  Area lt -c 120 129  NO3 lt -seq 2 5 length out   10   discharge lt -ex1221new Discharge area lt -ex1221new Area nitrogen lt -ex1221new NO3 p  lt - ggplot ex1221new  aes discharge  area   main  quot Point quot   mygraph lt -p   geom point aes size  nitrogen        scale size area     ggtitle  quot Weighted Scatterplot of Watershed Area vs  Discharge and Nitrogen Levels  PPM  quot    theme   plot title    element text color  quot Blue quot   size 30  hjust   0 5        change the styling of both the axis simultaneously from this-  axis title   element text color    quot Green quot   size   20  family  quot Courier quot            you can change the  axis title from the code below    mygraph labels x  quot Discharge of materials quot   changes x axis title    mygraph labels y  quot Area Affected quot    changes y axis title    mygraph         Also  you can change the labels title from the same formula used above - mygraph labels size   quot N2 quot   size contains the nitrogen level

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