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Axel Roy
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Asked: 2022-05-11T17:35:27+00:00 In:

error: discrete value supplied to continuous scale

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This is the program I run:

> 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")
## 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))

After I run, it returns an error

Error: Discrete value supplied to continuous scale

Does anyone have any suggestions for my problem: error: discrete value supplied to continuous scale in the r. How to correct it?

discrete value supplied
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3 Answers

  1. I see that you’re using continuous scale scale_x_continuous(), scale_y_continuous(),  therefore, the discrete value is not allowed in the position scales of your data frame. In your case, you were trying to create a continuous scale on discrete value containing characters.  That’s why the above error occurred.

    You just need to convert your meltDF variable to numeric, as suggested by the ItTutoria team above, in order to solve the problem.

    • 18

  2. If x has numeric value, add scale_x_continuous() to it. If x has character/factor values, add scale_x_discrete(). This could solve your problem.

    • 14
  3. Expert

    Your continuous scale is currently created on a discrete value containing characters rather than a continuous value, you need to convert that value to numeric, below is our suggestion:

    meltDF$variable=as.numeric(levels(meltDF$variable))[meltDF$variable]

    Then, just run your ggplot command above

    • 0

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