Stacked bar chart

Question

I would like to create a stacked chart using ggplot2 and geom bar   Here is my source data   Rank F1     F2     F3 1    500    250    50 2    400    100    30 3    300    155    100 4    200    90     10   I want a stacked chart where x is the rank and y is the values in F1  F2  F3     Getting Source Data   sample data  lt - read csv  sample data csv      Plot Chart   c  lt - ggplot sample data  aes x   sample data Rank  y   sample data F1     c   geom bar stat    identity     This is as far as i can get  I m not sure of how I can stack the rest of the field values   Maybe my data frame is not in a good format

User · Answer

You will need to melt your dataframe to get it into the so-called long format   require reshape2  sample data M  lt - melt sample data    Now your field values are represented by their own rows and identified through the variable column  This can now be leveraged within the ggplot aesthetics   require ggplot2  c  lt - ggplot sample data M  aes x   Rank  y   value  fill   variable   c   geom bar stat    identity     Instead of stacking you may also be interested in showing multiple plots using facets   c  lt - ggplot sample data M  aes x   Rank  y   value   c   facet wrap   variable    geom bar stat    identity

User · Answer

You said        Maybe my data frame is not in a good format    Yes this is true  Your data is in the wide format  You need to put it in the long format  Generally speaking  long format is better for variables comparison     Using reshape2 for example   you do this using melt   dat m  lt - melt dat id vars    Rank      just melt dat  should work   Then you get your barplot    ggplot dat m  aes x   Rank  y   value fill variable         geom bar stat  identity     But using lattice and barchart smart formula notation   you don t need to reshape your data   just do this   barchart F1 F2 F3 Rank data dat

User · Answer

Building on Roland s answer  using tidyr to reshape the data from wide to long   library tidyr  library ggplot2   df  lt - read table text  Rank F1     F2     F3 1    500    250    50 2    400    100    30 3    300    155    100 4    200    90     10   header TRUE   df   gt      gather variable  value  F1 F3    gt      ggplot aes x   Rank  y   value  fill   variable        geom bar stat    identity

User · Answer

You need to transform your data to long format and shouldn t use   inside aes   DF  lt - read table text  Rank F1     F2     F3 1    500    250    50 2    400    100    30 3    300    155    100 4    200    90     10   header TRUE   library reshape2  DF1  lt - melt DF  id var  Rank    library ggplot2  ggplot DF1  aes x   Rank  y   value  fill   variable        geom bar stat    identity

[r] Stacked bar chart

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