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Changing the legend names: R

Hello all, 

ggplot(dataset, aes( x = Norm, fill = Condition, y=log2(measure))) + geom_boxplot() +
    scale_fill_manual(values=c("brown1","darkolivegreen4","burlywood3")) + theme_classic() + 
    labs(title="Comparison",x="Norm", y = "counts") +
    scale_fill_continuous(labels = paste("condition1", "condition2", "condition3"))

I am trying to change the labels of the legend. Currently, it shows the labels that are present in my dataset. However, I want to change it to "condition1", "condition2", "condition3". Above is the code I am trying. It gives me following error.

Scale for 'fill' is already present. Adding another scale for 'fill', which will replace the existing scale. Error: Discrete value supplied to continuous scale In addition: Warning message: Removed 18 rows containing non-finite values (stat_boxplot).

Could someone help me here? TIA

r ggplot2
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updated by Kevin Blighe Kevin Blighe • written by KVC_bioinfo KVC_bioinfo

Not strictly a bioinformatics question, IMO. However, there is some overlap, enough to not close the question.

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written by Ram Ram

Another thing you might consider is making a copy of the 'Condition' column in your dataframe, converting it to Factor, then changing the 'levels' of the factor to "condition1", "condition2", etc.. This way, all the entries are still part of the same groupings, but those groups have the desired name for the plot.

• 1 views • link
written by steve steve

1 answer

You cannot use scale_fill_manual and scale_fill_continuous at the same time - they access the same information in the plot.

What you need is this:

ggplot(dataset, aes( x = Norm, fill = Condition, y=log2(measure))) + geom_boxplot() +
    scale_fill_manual(name="My new legend", values=c("brown1","darkolivegreen4","burlywood3", labels=c("condition1", "condition2", "condition3")) +
    theme_classic() + 
    labs(title="Comparison",x="Norm", y = "counts"))
• 1 views • link
written by Kevin Blighe Kevin Blighe

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