Subset and ggplot2

Question

I have a problem to plot a subset of a data frame with ggplot2  My df is like  df   data frame ID   c  P1    P1    P2    P2    P3    P3                    Value1   c 100  120  300  400  130  140                   Value2   c 12  13  11  16  15  12    How can I now plot Value1 vs Value2 only for IDs  P1  and  P3   For example I tried  ggplot subset df ID   quot P1  amp  P3 quot       geom line aes Value1  Value2  group ID  colour ID     but I always receive an error

User · Answer

agstudy s answer didn t work for me with the latest version of ggplot2  but this did  using maggritr pipes   ggplot data dat      geom line aes Value1  Value2  group ID  colour ID                   data       gt   filter ID  in  c  P1     P3       It works because if geom line sees that data is a function  it will call that function with the inherited version of data and use the output of that function as data

User · Answer

Your formulation is almost correct  You want   subset dat  ID   P1    ID   P3      Where the     pipe   means  or   Your solution  ID   P1  amp  P3   is looking for a case where ID is literally  P1  amp  P3

User · Answer

Try filter to subset only the rows of P1 and P3  df2  lt - filter df  ID     P1    ID     P3     Than yo can plot Value1  vs Value2

User · Answer

Are you looking for the following plot   library ggplot2   l lt -df df ID  in  c  P1   P3     myplot lt -ggplot l  geom line aes Value1  Value2  group ID  colour ID

User · Answer

Here 2 options for subsetting   Using subset from base R   library ggplot2  ggplot subset dat ID  in  c  P1     P3                 geom line aes Value1  Value2  group ID  colour ID     Using subset the argument of geom line Note I am using plyr package to use the special   function    library plyr  ggplot data dat      geom line aes Value1  Value2  group ID  colour ID                    subset     ID  in  c  P1     P3       You can also use the complementary subsetting   subset dat ID     P2

User · Answer

Use subset within ggplot  ggplot data   subset df  ID     P1    ID     P2        aes Value1  Value2  group ID  colour ID       geom line

User · Answer

There s another solution that I find useful  especially when I want to plot multiple subsets of the same object   myplot lt -ggplot df  geom line aes Value1  Value2  group ID  colour ID   myplot     subset df  ID  in  c  P1   P3    myplot     subset df  ID  in  c  P2

User · Answer

With option 2 in  agstudy s answer now deprecated  defining data with a function can be handy   library plyr  ggplot data dat       geom line aes Value1  Value2  group ID  colour ID               data function x  x ID  in  c  P1    P3      This approach comes in handy if you wish to reuse a dataset in the same plot  e g  you don t want to specify a new column in the data frame  or you want to explicitly plot one dataset in a layer above the other    library plyr  ggplot data dat  aes Value1  Value2  group ID  colour ID        geom line data function x  x  x ID  in  c  P1    P3        alpha 0 5      geom line data function x  x x ID  in  c  P1    P3

User · Answer

Similar to  nicolaskruchten s answer you could do the following  require ggplot2   df   data frame ID   c  P1    P1    P2    P2    P3    P3                    Value1   c 100  120  300  400  130  140                   Value2   c 12  13  11  16  15  12    ggplot df       geom line data     x  x ID  in  c  quot P1 quot     quot P3 quot                   aes Value1  Value2  group   ID  colour   ID

[r] Subset and ggplot2

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