Plotting with ggplot2 Error Discrete value supplied to continuous scale on categorical y-axis

Question

The plotting code below gives Error  Discrete value supplied to continuous scale  What s wrong with this code  It works fine until I try to change the scale so the error is there    I tried to figure out solutions from similar problem but couldn t   This is a head of my data    gt  dput head df   structure list  10    c 0  0  0  0  0  0    33 95    c 0  0   0  0  0  0    58 66    c 0  0  0  0  0  0    84 42    c 0  0   0  0  0  0    110 21    c 0  0  0  0  0  0    134 16    c 0   0  0  0  0  0    164 69    c 0  0  0  0  0  0    199 1    c 0   0  0  0  0  0    234 35    c 0  0  0  0  0  0    257 19    c 0   0  0  0  0  0    361 84    c 0  0  0  0  0  0    432 74    c 0   0  0  0  0  0    506 34    c 1  0  0  0  0  0    581 46    c 0   0  0  0  0  0    651 71    c 0  0  0  0  0  0    732 59    c 0   0  0  0  0  1    817 56    c 0  0  0  1  0  0    896 24    c 0   0  0  0  0  0    971 77    c 0  1  1  1  0  1    1038 91    c 0   0  0  0  0  0   MW   c 3 9  6 4  7 4  8 1  9  9 4     Names   c  10     33 95    58 66    84 42    110 21    134 16    164 69    199 1     234 35    257 19    361 84    432 74    506 34    581 46    651 71     732 59    817 56    896 24    971 77    1038 91    MW    row names   c  Merc     Peug    Fera    Fiat    Opel    Volv     class    data frame     The plotting code      Plotting meltDF   melt df  id vars    MW   ggplot meltDF meltDF value    1      geom point aes x   MW  y   variable       scale x continuous limits c 0  1200   breaks c 0  400  800  1200       scale y continuous limits c 0  1200   breaks c 0  400  800  1200     Here s how the plot looked before adding scale

User · Accepted Answer

As mentioned in the comments  there cannot be a continuous scale on variable of the factor type  You could change the factor to numeric as follows  just after you define the meltDF variable   meltDF variable as numeric levels meltDF variable   meltDF variable    Then  execute the ggplot command    ggplot meltDF meltDF value    1      geom point aes x   MW  y     variable          scale x continuous limits c 0  1200   breaks c 0  400  800  1200          scale y continuous limits c 0  1200   breaks c 0  400  800  1200     And you will have your chart   Hope this helps

User · Answer

if x is numeric  then add scale x continuous    if x is character factor  then add scale x discrete    This might solve your problem

User · Answer

In my case  you need to convert the column you think this column is numeric  but actually not  to numeric  geom segment data tmpp      aes x start pos      y lib complexity      xend end pos      yend lib complexity      to  geom segment data tmpp      aes x as numeric start pos       y as numeric lib complexity       xend as numeric end pos       yend as numeric lib complexity

[r] Plotting with ggplot2: "Error: Discrete value supplied to continuous scale" on categorical y-axis

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